initial commit

2026-06-26 04:20:20 +08:00
commit 869006e5e7
64 changed files with 4632 additions and 0 deletions
@@ -0,0 +1,132 @@
+# =========================
+# Build results
+# =========================
+bin/
+obj/
+out/
+publish/
+
+# =========================
+# User-specific files
+# =========================
+*.user
+*.rsuser
+*.suo
+*.userosscache
+*.sln.docstates
+
+# =========================
+# Logs
+# =========================
+*.log
+logs/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# =========================
+# Visual Studio Code
+# =========================
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+
+# =========================
+# Rider / JetBrains
+# =========================
+.idea/
+*.sln.iml
+
+# =========================
+# Visual Studio
+# =========================
+.vs/
+
+# =========================
+# OS generated files
+# =========================
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# =========================
+# Environment files
+# =========================
+.env
+.env.*
+!.env.example
+
+# =========================
+# ASP.NET / secrets
+# =========================
+appsettings.Development.json
+appsettings.*.local.json
+secrets.json
+
+# User Secrets (ASP.NET Core)
+secrets/
+**/secrets.json
+
+# =========================
+# Entity Framework
+# =========================
+# Migrations should usually be committed (DO NOT ignore)
+# But temp files:
+*.dbmdl
+*.edmx.diagram
+
+# =========================
+# NuGet
+# =========================
+*.nupkg
+*.snupkg
+packages/
+# keep lock file (important for reproducibility)
+!packages.lock.json
+
+# =========================
+# Node (if using frontend)
+# =========================
+node_modules/
+dist/
+build/
+data-protection-keys/
+
+# =========================
+# Docker
+# =========================
+docker-compose.override.yml
+*.local.yml
+
+# =========================
+# Test results
+# =========================
+TestResults/
+coverage/
+*.coverage
+*.coveragexml
+
+# =========================
+# Publish profiles
+# =========================
+Properties/PublishProfiles/*.pubxml
+!Properties/PublishProfiles/*.pubxml.user
+
+# =========================
+# Azure / cloud artifacts
+# =========================
+*.azurePubxml
+*.publishsettings
+
+# =========================
+# Temporary files
+# =========================
+*.tmp
+*.temp
+*.swp
+*.bak
+*.cache
+
+docs/plans
@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VigilCareRecordsAPI", "VigilCareRecordsAPI\VigilCareRecordsAPI.csproj", "{3975B2F5-259E-43BF-B1F3-FA08AF8EF90C}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3975B2F5-259E-43BF-B1F3-FA08AF8EF90C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3975B2F5-259E-43BF-B1F3-FA08AF8EF90C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3975B2F5-259E-43BF-B1F3-FA08AF8EF90C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3975B2F5-259E-43BF-B1F3-FA08AF8EF90C}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal
@@ -0,0 +1,13 @@
+public record ApiResponse<T>(bool Success, int StatusCode, T? Data, ApiError? Error)
+{
+    public static ApiResponse<T> Ok(T data) =>
+        new(true, 200, data, null);
+
+    public static ApiResponse<T> Created(T data) =>
+        new(true, 201, data, null);
+
+    public static ApiResponse<T> Fail(int statusCode, string message, string code) =>
+        new(false, statusCode, default, new ApiError(message, code));
+}
+
+public record ApiError(string Message, string Code);
@@ -0,0 +1,5 @@
+public class BadRequestException : DomainException
+{
+    public BadRequestException(string message, string errorCode = "BAD_REQUEST")
+        : base(message, errorCode) { }
+}
@@ -0,0 +1,5 @@
+public class ConflictException : DomainException
+{
+    public ConflictException(string message, string errorCode = "CONFLICT_ERROR")
+        : base(message, errorCode) { }
+}
@@ -0,0 +1,8 @@
+using Microsoft.EntityFrameworkCore;
+
+public static class DbExceptions
+{
+    public static bool IsUniqueViolation(DbUpdateException ex) =>
+        ex.InnerException?.Message.Contains("23505") == true
+        || ex.InnerException?.Message.Contains("unique constraint") == true;
+}
@@ -0,0 +1,9 @@
+public abstract class DomainException : Exception
+{
+    public string ErrorCode { get; }
+
+    protected DomainException(string message, string errorCode) : base(message)
+    {
+        ErrorCode = errorCode;
+    }
+}
@@ -0,0 +1,5 @@
+public class NotFoundException : DomainException
+{
+    public NotFoundException(string message, string errorCode = "NOT_FOUND")
+        : base(message, errorCode) { }
+}
@@ -0,0 +1,5 @@
+public class ValidationException : DomainException
+{
+    public ValidationException(string message, string errorCode = "VALIDATION_ERROR")
+        : base(message, errorCode) { }
+}
@@ -0,0 +1,8 @@
+public class JwtOptions
+{
+    public const string Section = "Jwt";
+    public string Secret { get; set; } = null!;
+    public string Issuer { get; set; } = null!;
+    public string Audience { get; set; } = null!;
+    public int ExpiryMinutes { get; set; } = 480;
+}
@@ -0,0 +1,10 @@
+public class MinioOptions
+{
+    public const string Section = "Minio";
+    public string Endpoint { get; set; } = null!;
+    public string AccessKey { get; set; } = null!;
+    public string SecretKey { get; set; } = null!;
+    public string BucketName { get; set; } = "scans";
+    public bool UseSsl { get; set; }
+    public int PresignedUrlExpiryMinutes { get; set; } = 15;
+}
@@ -0,0 +1,47 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+
+/// <summary>
+/// JWT authentication and current user info.
+/// </summary>
+[ApiController]
+[Route("api/v1/auth")]
+[Produces("application/json")]
+public class AuthController : ControllerBase
+{
+    private readonly IAuthService _auth;
+
+    public AuthController(IAuthService auth) => _auth = auth;
+
+    /// <summary>
+    /// Authenticates a user and returns a JWT with role claims.
+    /// </summary>
+    [HttpPost("login")]
+    [ProducesResponseType(typeof(ApiResponse<LoginResponse>), StatusCodes.Status200OK)]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status422UnprocessableEntity)]
+    public async Task<IActionResult> Login([FromBody] LoginRequest req)
+    {
+        var result = await _auth.LoginAsync(req);
+        return Ok(ApiResponse<LoginResponse>.Ok(result));
+    }
+
+    /// <summary>
+    /// Returns the current authenticated user's profile.
+    /// </summary>
+    [HttpGet("me")]
+    [Authorize]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status200OK)]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status401Unauthorized)]
+    public async Task<IActionResult> Me()
+    {
+        var userId = Guid.Parse(User.FindFirstValue(ClaimTypes.NameIdentifier)!);
+        var user = await _auth.GetCurrentUserAsync(userId);
+        return Ok(ApiResponse<object>.Ok(new
+        {
+            user.Id, user.Username, user.FullName,
+            role = user.Role.ToDbString()
+        }));
+    }
+}
@@ -0,0 +1,116 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+
+/// <summary>
+/// Batch CRUD, document upload, and assignment for the digitization workflow.
+/// </summary>
+[ApiController]
+[Route("api/v1/digitization-batches")]
+[Produces("application/json")]
+[Authorize]
+public class DigitizationBatchesController : ControllerBase
+{
+    private readonly IBatchService _batches;
+    private readonly IDocumentStorageService _storage;
+
+    private static readonly HashSet<string> _allowedMimeTypes = new()
+    {
+        "application/pdf", "image/jpeg", "image/png"
+    };
+
+    public DigitizationBatchesController(IBatchService batches, IDocumentStorageService storage)
+    {
+        _batches = batches;
+        _storage = storage;
+    }
+
+    /// <summary>
+    /// Uploads a scanned document and creates a new digitization batch.
+    /// </summary>
+    [HttpPost]
+    [ProducesResponseType(typeof(ApiResponse<BatchDetailResponse>), StatusCodes.Status201Created)]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status409Conflict)]
+    [RequestSizeLimit(25 * 1024 * 1024)]
+    public async Task<IActionResult> Create(
+        IFormFile file,
+        [FromForm] CreateBatchRequest req)
+    {
+        if (file is null || file.Length == 0)
+            return BadRequest(ApiResponse<object>.Fail(400, "File is required.", "EMPTY_FILE"));
+
+        if (!_allowedMimeTypes.Contains(file.ContentType))
+            return BadRequest(ApiResponse<object>.Fail(400,
+                "Accepted formats: PDF, JPEG, PNG.", "INVALID_MIME_TYPE"));
+
+        var parsedBatchType = BatchTypeExtensions.FromDbString(req.BatchType.ToUpperInvariant());
+        var parsedTrack = string.IsNullOrEmpty(req.Track)
+            ? BatchTrack.Backfill
+            : BatchTrackExtensions.FromDbString(req.Track.ToUpperInvariant());
+        var actorUserId = Guid.Parse(User.FindFirstValue(ClaimTypes.NameIdentifier)!);
+
+        using var stream = file.OpenReadStream();
+        var batch = await _batches.CreateAsync(
+            stream, file.ContentType, parsedBatchType, parsedTrack, req.PatientId, actorUserId);
+        return StatusCode(201, ApiResponse<BatchDetailResponse>.Created(BatchDetailResponse.FromEntity(batch)));
+    }
+
+    /// <summary>
+    /// Gets a batch by ID with a presigned document URL (15-minute expiry).
+    /// </summary>
+    [HttpGet("{id:guid}")]
+    [ProducesResponseType(typeof(ApiResponse<BatchDetailResponse>), StatusCodes.Status200OK)]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> Get(Guid id)
+    {
+        var batch = await _batches.GetByIdAsync(id);
+        var presignedUrl = await _storage.GetPresignedUrlAsync(batch.DocumentRef);
+
+        return Ok(ApiResponse<BatchDetailResponse>.Ok(
+            BatchDetailResponse.FromEntity(batch, presignedUrl)));
+    }
+
+    /// <summary>
+    /// Lists batches with optional filters and pagination.
+    /// </summary>
+    [HttpGet]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status200OK)]
+    public async Task<IActionResult> List(
+        [FromQuery] string? status,
+        [FromQuery] string? batchType,
+        [FromQuery] Guid? assignedTo,
+        [FromQuery] string? track,
+        [FromQuery] int page = 1,
+        [FromQuery] int pageSize = 20)
+    {
+        BatchStatus? parsedStatus = string.IsNullOrEmpty(status) ? null : BatchStatusExtensions.FromDbString(status.ToUpperInvariant());
+        BatchType? parsedBatchType = string.IsNullOrEmpty(batchType) ? null : BatchTypeExtensions.FromDbString(batchType.ToUpperInvariant());
+        BatchTrack? parsedTrack = string.IsNullOrEmpty(track) ? null : BatchTrackExtensions.FromDbString(track.ToUpperInvariant());
+
+        var result = await _batches.ListAsync(parsedStatus, parsedBatchType, assignedTo, parsedTrack, page, pageSize);
+        return Ok(ApiResponse<object>.Ok(new
+        {
+            items = result.Items,
+            page = result.Page,
+            pageSize = result.PageSize,
+            totalCount = result.TotalCount,
+            totalPages = result.TotalPages
+        }));
+    }
+
+    /// <summary>
+    /// Assigns a batch to an entry clerk. Uses Redis lock to prevent double-assignment.
+    /// </summary>
+    [HttpPatch("{id:guid}/assign")]
+    [ProducesResponseType(typeof(ApiResponse<BatchDetailResponse>), StatusCodes.Status200OK)]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status404NotFound)]
+    [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> Assign(Guid id, [FromBody] AssignBatchRequest req)
+    {
+        var actorUserId = Guid.Parse(User.FindFirstValue(ClaimTypes.NameIdentifier)!);
+        var batch = await _batches.AssignAsync(id, req.EntryClerkUserId, actorUserId);
+        return Ok(ApiResponse<BatchDetailResponse>.Ok(BatchDetailResponse.FromEntity(batch)));
+    }
+}
@@ -0,0 +1,19 @@
+using Microsoft.EntityFrameworkCore;
+
+public class AppDbContext : DbContext
+{
+    public AppDbContext(DbContextOptions<AppDbContext> options) : base(options) { }
+
+    public DbSet<User> Users => Set<User>();
+    public DbSet<DigitizationBatch> DigitizationBatches => Set<DigitizationBatch>();
+    public DbSet<ScannedDocument> ScannedDocuments => Set<ScannedDocument>();
+    public DbSet<DraftPatient> DraftPatients => Set<DraftPatient>();
+    public DbSet<DraftEncounter> DraftEncounters => Set<DraftEncounter>();
+    public DbSet<DraftObservation> DraftObservations => Set<DraftObservation>();
+    public DbSet<DigitizationEvent> DigitizationEvents => Set<DigitizationEvent>();
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.ApplyConfigurationsFromAssembly(typeof(AppDbContext).Assembly);
+    }
+}
@@ -0,0 +1,60 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+public class DigitizationBatchConfiguration : IEntityTypeConfiguration<DigitizationBatch>
+{
+    public void Configure(EntityTypeBuilder<DigitizationBatch> builder)
+    {
+        builder.ToTable("digitization_batches", t =>
+        {
+            t.HasCheckConstraint("chk_batches_status",
+                "status IN ('UPLOADED', 'IN_ENTRY', 'PENDING_VERIFICATION', 'REJECTED', 'VERIFIED', 'AWAITING_CLINICAL_APPROVAL', 'APPROVED', 'PROMOTED')");
+            t.HasCheckConstraint("chk_batches_batch_type",
+                "batch_type IN ('PATIENT_REGISTRATION', 'ENCOUNTER_SUMMARY', 'VITALS_SHEET', 'LAB_RESULTS', 'MEDICATION_LIST', 'ALLERGY_UPDATE', 'MIXED')");
+            t.HasCheckConstraint("chk_batches_track",
+                "track IN ('BACKFILL', 'LIVE_CAPTURE')");
+        });
+        builder.HasKey(b => b.Id);
+        builder.Property(b => b.Id).HasColumnName("id").HasDefaultValueSql("gen_random_uuid()");
+        builder.Property(b => b.Status)
+            .HasColumnName("status")
+            .HasMaxLength(30)
+            .HasConversion(v => v.ToDbString(), v => BatchStatusExtensions.FromDbString(v))
+            .HasDefaultValueSql("'UPLOADED'")
+            .HasSentinel((BatchStatus)(-1));
+        builder.Property(b => b.BatchType)
+            .HasColumnName("batch_type")
+            .HasMaxLength(30)
+            .HasConversion(v => v.ToDbString(), v => BatchTypeExtensions.FromDbString(v))
+            .IsRequired();
+        builder.Property(b => b.Track)
+            .HasColumnName("track")
+            .HasMaxLength(20)
+            .HasConversion(v => v.ToDbString(), v => BatchTrackExtensions.FromDbString(v))
+            .HasDefaultValueSql("'BACKFILL'")
+            .HasSentinel((BatchTrack)(-1));
+        builder.Property(b => b.PatientId).HasColumnName("patient_id");
+        builder.Property(b => b.EncounterDraftId).HasColumnName("encounter_draft_id");
+        builder.Property(b => b.DocumentRef).HasColumnName("document_ref").HasMaxLength(500).IsRequired();
+        builder.Property(b => b.DocumentSha256).HasColumnName("document_sha256").HasMaxLength(64).IsRequired();
+        builder.Property(b => b.EnableRetroactiveAlerts).HasColumnName("enable_retroactive_alerts").HasDefaultValue(false);
+        builder.Property(b => b.EnteredByUserId).HasColumnName("entered_by_user_id");
+        builder.Property(b => b.VerifiedByUserId).HasColumnName("verified_by_user_id");
+        builder.Property(b => b.ApprovedByUserId).HasColumnName("approved_by_user_id");
+        builder.Property(b => b.RejectionReason).HasColumnName("rejection_reason");
+        builder.Property(b => b.PromotedAt).HasColumnName("promoted_at");
+        builder.Property(b => b.PromotionEncounterId).HasColumnName("promotion_encounter_id");
+        builder.Property(b => b.SupersedesBatchId).HasColumnName("supersedes_batch_id");
+        builder.Property(b => b.ClinicianAttestation).HasColumnName("clinician_attestation").HasDefaultValue(false);
+        builder.Property(b => b.CreatedAt).HasColumnName("created_at").HasDefaultValueSql("NOW()");
+        builder.Property(b => b.UpdatedAt).HasColumnName("updated_at").HasDefaultValueSql("NOW()");
+
+        builder.HasOne(b => b.EnteredByUser).WithMany().HasForeignKey(b => b.EnteredByUserId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(b => b.VerifiedByUser).WithMany().HasForeignKey(b => b.VerifiedByUserId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(b => b.ApprovedByUser).WithMany().HasForeignKey(b => b.ApprovedByUserId).OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasIndex(b => b.Status);
+        builder.HasIndex(b => new { b.DocumentSha256, b.PatientId, b.CreatedAt });
+        builder.HasIndex(b => b.SupersedesBatchId).HasFilter("supersedes_batch_id IS NOT NULL");
+    }
+}
@@ -0,0 +1,32 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+public class DigitizationEventConfiguration : IEntityTypeConfiguration<DigitizationEvent>
+{
+    public void Configure(EntityTypeBuilder<DigitizationEvent> builder)
+    {
+        builder.ToTable("digitization_events", t =>
+        {
+            t.HasCheckConstraint("chk_digitization_events_event_type",
+                "event_type IN ('uploaded', 'entry_started', 'submitted_for_verification', 'rejected', 'verified', 'verified_pending_clinical', 'awaiting_clinical_approval', 'approved', 'promoted', 'live_capture_attested', 'correction_requested', 'verification_failed', 'superseded', 'correction_promoted', 'correction_uploaded', 'promotion_retry_succeeded', 'promotion_retry_failed', 'promotion_retry_exhausted', 'promotion_failed')");
+        });
+        builder.HasKey(e => e.Id);
+        builder.Property(e => e.Id).HasColumnName("id").HasDefaultValueSql("gen_random_uuid()");
+        builder.Property(e => e.BatchId).HasColumnName("batch_id").IsRequired();
+        builder.Property(e => e.EventType)
+            .HasColumnName("event_type")
+            .HasMaxLength(50)
+            .HasConversion(
+                v => v.ToDbString(),
+                v => DigitizationEventTypeExtensions.FromDbString(v))
+            .IsRequired();
+        builder.Property(e => e.ActorUserId).HasColumnName("actor_user_id").IsRequired();
+        builder.Property(e => e.OccurredAt).HasColumnName("occurred_at").HasDefaultValueSql("NOW()");
+        builder.Property(e => e.MetadataJson).HasColumnName("metadata_json").HasColumnType("jsonb");
+
+        builder.HasOne(e => e.Batch).WithMany(b => b.Events).HasForeignKey(e => e.BatchId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasOne(e => e.Actor).WithMany().HasForeignKey(e => e.ActorUserId).OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasIndex(e => new { e.BatchId, e.OccurredAt });
+    }
+}
@@ -0,0 +1,32 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+public class DraftEncounterConfiguration : IEntityTypeConfiguration<DraftEncounter>
+{
+    public void Configure(EntityTypeBuilder<DraftEncounter> builder)
+    {
+        builder.ToTable("draft_encounters", t =>
+        {
+            t.HasCheckConstraint("chk_draft_encounters_department",
+                "department IS NULL OR department IN ('Emergency Department', 'Internal Medicine', 'General Medicine', 'Surgery', 'ICU', 'NICU', 'Medical-Surgical', 'Outpatient Clinic', 'Pediatrics', 'Obstetrics & Gynecology', 'Labor & Delivery', 'Cardiology', 'Orthopedics', 'Neurology', 'Oncology', 'Radiology', 'Laboratory', 'Psychiatry', 'Physical Therapy', 'Anesthesiology')");
+        });
+        builder.HasKey(e => e.Id);
+        builder.Property(e => e.Id).HasColumnName("id").HasDefaultValueSql("gen_random_uuid()");
+        builder.Property(e => e.BatchId).HasColumnName("batch_id").IsRequired();
+        builder.Property(e => e.AdmissionDate).HasColumnName("admission_date");
+        builder.Property(e => e.Department)
+            .HasColumnName("department")
+            .HasMaxLength(100)
+            .HasConversion(
+                v => v.HasValue ? v.Value.ToDbString() : null,
+                v => v == null ? null : DepartmentExtensions.FromDbString(v));
+        builder.Property(e => e.RoomBed).HasColumnName("room_bed").HasMaxLength(50);
+        builder.Property(e => e.AdmissionReason).HasColumnName("admission_reason").HasMaxLength(500);
+        builder.Property(e => e.DischargeDiagnosis).HasColumnName("discharge_diagnosis").HasMaxLength(500);
+        builder.Property(e => e.Status).HasColumnName("status").HasMaxLength(20);
+        builder.Property(e => e.CreatedAt).HasColumnName("created_at").HasDefaultValueSql("NOW()");
+        builder.Property(e => e.UpdatedAt).HasColumnName("updated_at").HasDefaultValueSql("NOW()");
+
+        builder.HasOne(e => e.Batch).WithOne(b => b.DraftEncounter).HasForeignKey<DraftEncounter>(e => e.BatchId).OnDelete(DeleteBehavior.Cascade);
+    }
+}
@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+public class DraftObservationConfiguration : IEntityTypeConfiguration<DraftObservation>
+{
+    public void Configure(EntityTypeBuilder<DraftObservation> builder)
+    {
+        builder.ToTable("draft_observations");
+        builder.HasKey(o => o.Id);
+        builder.Property(o => o.Id).HasColumnName("id").HasDefaultValueSql("gen_random_uuid()");
+        builder.Property(o => o.BatchId).HasColumnName("batch_id").IsRequired();
+        builder.Property(o => o.ObservationCode).HasColumnName("observation_code").HasMaxLength(50).IsRequired();
+        builder.Property(o => o.Value).HasColumnName("value").HasColumnType("decimal(10,3)").IsRequired();
+        builder.Property(o => o.Unit).HasColumnName("unit").HasMaxLength(20).IsRequired();
+        builder.Property(o => o.RecordedAt).HasColumnName("recorded_at").IsRequired();
+        builder.Property(o => o.Note).HasColumnName("note").HasMaxLength(500);
+        builder.Property(o => o.CreatedAt).HasColumnName("created_at").HasDefaultValueSql("NOW()");
+
+        builder.HasOne(o => o.Batch).WithMany(b => b.DraftObservations).HasForeignKey(o => o.BatchId).OnDelete(DeleteBehavior.Cascade);
+        builder.HasIndex(o => new { o.BatchId, o.ObservationCode });
+    }
+}
@@ -0,0 +1,35 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+public class DraftPatientConfiguration : IEntityTypeConfiguration<DraftPatient>
+{
+    public void Configure(EntityTypeBuilder<DraftPatient> builder)
+    {
+        builder.ToTable("draft_patients", t =>
+        {
+            t.HasCheckConstraint("chk_draft_patients_blood_type",
+                "blood_type IS NULL OR blood_type IN ('A+', 'A-', 'B+', 'B-', 'AB+', 'AB-', 'O+', 'O-')");
+        });
+        builder.HasKey(p => p.Id);
+        builder.Property(p => p.Id).HasColumnName("id").HasDefaultValueSql("gen_random_uuid()");
+        builder.Property(p => p.BatchId).HasColumnName("batch_id").IsRequired();
+        builder.Property(p => p.FullName).HasColumnName("full_name").HasMaxLength(200);
+        builder.Property(p => p.DateOfBirth).HasColumnName("date_of_birth");
+        builder.Property(p => p.Sex).HasColumnName("sex").HasMaxLength(10);
+        builder.Property(p => p.BloodType)
+            .HasColumnName("blood_type")
+            .HasMaxLength(10)
+            .HasConversion(
+                v => v.HasValue ? v.Value.ToDbString() : null,
+                v => v == null ? null : BloodTypeExtensions.FromDbString(v));
+        builder.Property(p => p.EmergencyContact).HasColumnName("emergency_contact").HasMaxLength(500);
+        builder.Property(p => p.AllergiesJson).HasColumnName("allergies_json").HasColumnType("jsonb");
+        builder.Property(p => p.NoKnownAllergies).HasColumnName("no_known_allergies").HasDefaultValue(false);
+        builder.Property(p => p.MedicationsJson).HasColumnName("medications_json").HasColumnType("jsonb");
+        builder.Property(p => p.NoActiveMedications).HasColumnName("no_active_medications").HasDefaultValue(false);
+        builder.Property(p => p.CreatedAt).HasColumnName("created_at").HasDefaultValueSql("NOW()");
+        builder.Property(p => p.UpdatedAt).HasColumnName("updated_at").HasDefaultValueSql("NOW()");
+
+        builder.HasOne(p => p.Batch).WithOne(b => b.DraftPatient).HasForeignKey<DraftPatient>(p => p.BatchId).OnDelete(DeleteBehavior.Cascade);
+    }
+}
@@ -0,0 +1,21 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+public class ScannedDocumentConfiguration : IEntityTypeConfiguration<ScannedDocument>
+{
+    public void Configure(EntityTypeBuilder<ScannedDocument> builder)
+    {
+        builder.ToTable("scanned_documents");
+        builder.HasKey(d => d.Id);
+        builder.Property(d => d.Id).HasColumnName("id").HasDefaultValueSql("gen_random_uuid()");
+        builder.Property(d => d.BatchId).HasColumnName("batch_id").IsRequired();
+        builder.Property(d => d.ObjectKey).HasColumnName("object_key").HasMaxLength(500).IsRequired();
+        builder.Property(d => d.Sha256).HasColumnName("sha256").HasMaxLength(64).IsRequired();
+        builder.Property(d => d.ContentType).HasColumnName("content_type").HasMaxLength(100).IsRequired();
+        builder.Property(d => d.FileSizeBytes).HasColumnName("file_size_bytes").IsRequired();
+        builder.Property(d => d.UploadedAt).HasColumnName("uploaded_at").HasDefaultValueSql("NOW()");
+
+        builder.HasOne(d => d.Batch).WithOne(b => b.Document).HasForeignKey<ScannedDocument>(d => d.BatchId).OnDelete(DeleteBehavior.Restrict);
+        builder.HasIndex(d => d.Sha256);
+    }
+}
@@ -0,0 +1,30 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+public class UserConfiguration : IEntityTypeConfiguration<User>
+{
+    public void Configure(EntityTypeBuilder<User> builder)
+    {
+        builder.ToTable("users", t =>
+        {
+            t.HasCheckConstraint("chk_users_role",
+                "role IN ('INTAKE_CLERK', 'DATA_ENTRY_CLERK', 'VERIFIER', 'CLINICAL_APPROVER', 'CLINICIAN', 'ADMINISTRATOR')");
+        });
+        builder.HasKey(u => u.Id);
+        builder.Property(u => u.Id).HasColumnName("id").HasDefaultValueSql("gen_random_uuid()");
+        builder.Property(u => u.Username).HasColumnName("username").HasMaxLength(100).IsRequired();
+        builder.Property(u => u.PasswordHash).HasColumnName("password_hash").HasMaxLength(200).IsRequired();
+        builder.Property(u => u.FullName).HasColumnName("full_name").HasMaxLength(200).IsRequired();
+        builder.Property(u => u.Role)
+            .HasColumnName("role")
+            .HasMaxLength(30)
+            .HasConversion(
+                v => v.ToDbString(),
+                v => UserRoleExtensions.FromDbString(v))
+            .IsRequired();
+        builder.Property(u => u.IsActive).HasColumnName("is_active").HasDefaultValue(true);
+        builder.Property(u => u.CreatedAt).HasColumnName("created_at").HasDefaultValueSql("NOW()");
+
+        builder.HasIndex(u => u.Username).IsUnique();
+    }
+}
@@ -0,0 +1,598 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace VigilCareRecordsAPI.Data.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20260625195830_InitialCreate")]
+    partial class InitialCreate
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.4")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("DigitizationBatch", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid?>("ApprovedByUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("approved_by_user_id");
+
+                    b.Property<string>("BatchType")
+                        .IsRequired()
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)")
+                        .HasColumnName("batch_type");
+
+                    b.Property<bool>("ClinicianAttestation")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("clinician_attestation");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("DocumentRef")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("document_ref");
+
+                    b.Property<string>("DocumentSha256")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)")
+                        .HasColumnName("document_sha256");
+
+                    b.Property<bool>("EnableRetroactiveAlerts")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("enable_retroactive_alerts");
+
+                    b.Property<Guid?>("EncounterDraftId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("encounter_draft_id");
+
+                    b.Property<Guid?>("EnteredByUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("entered_by_user_id");
+
+                    b.Property<Guid?>("PatientId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("patient_id");
+
+                    b.Property<DateTimeOffset?>("PromotedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("promoted_at");
+
+                    b.Property<Guid?>("PromotionEncounterId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("promotion_encounter_id");
+
+                    b.Property<string>("RejectionReason")
+                        .HasColumnType("text")
+                        .HasColumnName("rejection_reason");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)")
+                        .HasColumnName("status")
+                        .HasDefaultValueSql("'UPLOADED'");
+
+                    b.Property<Guid?>("SupersedesBatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("supersedes_batch_id");
+
+                    b.Property<string>("Track")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasColumnName("track")
+                        .HasDefaultValueSql("'BACKFILL'");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<Guid?>("VerifiedByUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("verified_by_user_id");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ApprovedByUserId");
+
+                    b.HasIndex("EnteredByUserId");
+
+                    b.HasIndex("Status");
+
+                    b.HasIndex("SupersedesBatchId")
+                        .HasFilter("supersedes_batch_id IS NOT NULL");
+
+                    b.HasIndex("VerifiedByUserId");
+
+                    b.HasIndex("DocumentSha256", "PatientId", "CreatedAt");
+
+                    b.ToTable("digitization_batches", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_batches_batch_type", "batch_type IN ('PATIENT_REGISTRATION', 'ENCOUNTER_SUMMARY', 'VITALS_SHEET', 'LAB_RESULTS', 'MEDICATION_LIST', 'ALLERGY_UPDATE', 'MIXED')");
+
+                            t.HasCheckConstraint("chk_batches_status", "status IN ('UPLOADED', 'IN_ENTRY', 'PENDING_VERIFICATION', 'REJECTED', 'VERIFIED', 'AWAITING_CLINICAL_APPROVAL', 'APPROVED', 'PROMOTED')");
+
+                            t.HasCheckConstraint("chk_batches_track", "track IN ('BACKFILL', 'LIVE_CAPTURE')");
+                        });
+                });
+
+            modelBuilder.Entity("DigitizationEvent", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid>("ActorUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("actor_user_id");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<string>("EventType")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("event_type");
+
+                    b.Property<string>("MetadataJson")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("metadata_json");
+
+                    b.Property<DateTimeOffset>("OccurredAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("occurred_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ActorUserId");
+
+                    b.HasIndex("BatchId", "OccurredAt");
+
+                    b.ToTable("digitization_events", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_digitization_events_event_type", "event_type IN ('uploaded', 'entry_started', 'submitted_for_verification', 'rejected', 'verified', 'verified_pending_clinical', 'awaiting_clinical_approval', 'approved', 'promoted', 'live_capture_attested', 'correction_requested', 'verification_failed', 'superseded', 'correction_promoted', 'correction_uploaded', 'promotion_retry_succeeded', 'promotion_retry_failed', 'promotion_retry_exhausted', 'promotion_failed')");
+                        });
+                });
+
+            modelBuilder.Entity("DraftEncounter", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<DateTimeOffset?>("AdmissionDate")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("admission_date");
+
+                    b.Property<string>("AdmissionReason")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("admission_reason");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("Department")
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("department");
+
+                    b.Property<string>("DischargeDiagnosis")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("discharge_diagnosis");
+
+                    b.Property<string>("RoomBed")
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("room_bed");
+
+                    b.Property<string>("Status")
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasColumnName("status");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId")
+                        .IsUnique();
+
+                    b.ToTable("draft_encounters", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_draft_encounters_department", "department IS NULL OR department IN ('Emergency Department', 'Internal Medicine', 'General Medicine', 'Surgery', 'ICU', 'NICU', 'Medical-Surgical', 'Outpatient Clinic', 'Pediatrics', 'Obstetrics & Gynecology', 'Labor & Delivery', 'Cardiology', 'Orthopedics', 'Neurology', 'Oncology', 'Radiology', 'Laboratory', 'Psychiatry', 'Physical Therapy', 'Anesthesiology')");
+                        });
+                });
+
+            modelBuilder.Entity("DraftObservation", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("Note")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("note");
+
+                    b.Property<string>("ObservationCode")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("observation_code");
+
+                    b.Property<DateTimeOffset>("RecordedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("recorded_at");
+
+                    b.Property<string>("Unit")
+                        .IsRequired()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasColumnName("unit");
+
+                    b.Property<decimal>("Value")
+                        .HasColumnType("decimal(10,3)")
+                        .HasColumnName("value");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId", "ObservationCode");
+
+                    b.ToTable("draft_observations", (string)null);
+                });
+
+            modelBuilder.Entity("DraftPatient", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<string>("AllergiesJson")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("allergies_json");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<string>("BloodType")
+                        .HasMaxLength(10)
+                        .HasColumnType("character varying(10)")
+                        .HasColumnName("blood_type");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<DateOnly?>("DateOfBirth")
+                        .HasColumnType("date")
+                        .HasColumnName("date_of_birth");
+
+                    b.Property<string>("EmergencyContact")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("emergency_contact");
+
+                    b.Property<string>("FullName")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("full_name");
+
+                    b.Property<string>("MedicationsJson")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("medications_json");
+
+                    b.Property<bool>("NoActiveMedications")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("no_active_medications");
+
+                    b.Property<bool>("NoKnownAllergies")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("no_known_allergies");
+
+                    b.Property<string>("Sex")
+                        .HasMaxLength(10)
+                        .HasColumnType("character varying(10)")
+                        .HasColumnName("sex");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId")
+                        .IsUnique();
+
+                    b.ToTable("draft_patients", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_draft_patients_blood_type", "blood_type IS NULL OR blood_type IN ('A+', 'A-', 'B+', 'B-', 'AB+', 'AB-', 'O+', 'O-')");
+                        });
+                });
+
+            modelBuilder.Entity("ScannedDocument", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<string>("ContentType")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("content_type");
+
+                    b.Property<long>("FileSizeBytes")
+                        .HasColumnType("bigint")
+                        .HasColumnName("file_size_bytes");
+
+                    b.Property<string>("ObjectKey")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("object_key");
+
+                    b.Property<string>("Sha256")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)")
+                        .HasColumnName("sha256");
+
+                    b.Property<DateTimeOffset>("UploadedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("uploaded_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId")
+                        .IsUnique();
+
+                    b.HasIndex("Sha256");
+
+                    b.ToTable("scanned_documents", (string)null);
+                });
+
+            modelBuilder.Entity("User", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("FullName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("full_name");
+
+                    b.Property<bool>("IsActive")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(true)
+                        .HasColumnName("is_active");
+
+                    b.Property<string>("PasswordHash")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("password_hash");
+
+                    b.Property<string>("Role")
+                        .IsRequired()
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)")
+                        .HasColumnName("role");
+
+                    b.Property<string>("Username")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("username");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Username")
+                        .IsUnique();
+
+                    b.ToTable("users", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_users_role", "role IN ('INTAKE_CLERK', 'DATA_ENTRY_CLERK', 'VERIFIER', 'CLINICAL_APPROVER', 'CLINICIAN', 'ADMINISTRATOR')");
+                        });
+                });
+
+            modelBuilder.Entity("DigitizationBatch", b =>
+                {
+                    b.HasOne("User", "ApprovedByUser")
+                        .WithMany()
+                        .HasForeignKey("ApprovedByUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.HasOne("User", "EnteredByUser")
+                        .WithMany()
+                        .HasForeignKey("EnteredByUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.HasOne("User", "VerifiedByUser")
+                        .WithMany()
+                        .HasForeignKey("VerifiedByUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("ApprovedByUser");
+
+                    b.Navigation("EnteredByUser");
+
+                    b.Navigation("VerifiedByUser");
+                });
+
+            modelBuilder.Entity("DigitizationEvent", b =>
+                {
+                    b.HasOne("User", "Actor")
+                        .WithMany()
+                        .HasForeignKey("ActorUserId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithMany("Events")
+                        .HasForeignKey("BatchId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Actor");
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DraftEncounter", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithOne("DraftEncounter")
+                        .HasForeignKey("DraftEncounter", "BatchId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DraftObservation", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithMany("DraftObservations")
+                        .HasForeignKey("BatchId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DraftPatient", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithOne("DraftPatient")
+                        .HasForeignKey("DraftPatient", "BatchId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("ScannedDocument", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithOne("Document")
+                        .HasForeignKey("ScannedDocument", "BatchId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DigitizationBatch", b =>
+                {
+                    b.Navigation("Document");
+
+                    b.Navigation("DraftEncounter");
+
+                    b.Navigation("DraftObservations");
+
+                    b.Navigation("DraftPatient");
+
+                    b.Navigation("Events");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
@@ -0,0 +1,316 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace VigilCareRecordsAPI.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class InitialCreate : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "users",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false, defaultValueSql: "gen_random_uuid()"),
+                    username = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: false),
+                    password_hash = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    full_name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    role = table.Column<string>(type: "character varying(30)", maxLength: 30, nullable: false),
+                    is_active = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
+                    created_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_users", x => x.id);
+                    table.CheckConstraint("chk_users_role", "role IN ('INTAKE_CLERK', 'DATA_ENTRY_CLERK', 'VERIFIER', 'CLINICAL_APPROVER', 'CLINICIAN', 'ADMINISTRATOR')");
+                });
+
+            migrationBuilder.CreateTable(
+                name: "digitization_batches",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false, defaultValueSql: "gen_random_uuid()"),
+                    status = table.Column<string>(type: "character varying(30)", maxLength: 30, nullable: false, defaultValueSql: "'UPLOADED'"),
+                    batch_type = table.Column<string>(type: "character varying(30)", maxLength: 30, nullable: false),
+                    track = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValueSql: "'BACKFILL'"),
+                    patient_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    encounter_draft_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    document_ref = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: false),
+                    document_sha256 = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: false),
+                    enable_retroactive_alerts = table.Column<bool>(type: "boolean", nullable: false, defaultValue: false),
+                    entered_by_user_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    verified_by_user_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    approved_by_user_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    rejection_reason = table.Column<string>(type: "text", nullable: true),
+                    promoted_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    promotion_encounter_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    supersedes_batch_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    clinician_attestation = table.Column<bool>(type: "boolean", nullable: false, defaultValue: false),
+                    created_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()"),
+                    updated_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_digitization_batches", x => x.id);
+                    table.CheckConstraint("chk_batches_batch_type", "batch_type IN ('PATIENT_REGISTRATION', 'ENCOUNTER_SUMMARY', 'VITALS_SHEET', 'LAB_RESULTS', 'MEDICATION_LIST', 'ALLERGY_UPDATE', 'MIXED')");
+                    table.CheckConstraint("chk_batches_status", "status IN ('UPLOADED', 'IN_ENTRY', 'PENDING_VERIFICATION', 'REJECTED', 'VERIFIED', 'AWAITING_CLINICAL_APPROVAL', 'APPROVED', 'PROMOTED')");
+                    table.CheckConstraint("chk_batches_track", "track IN ('BACKFILL', 'LIVE_CAPTURE')");
+                    table.ForeignKey(
+                        name: "FK_digitization_batches_users_approved_by_user_id",
+                        column: x => x.approved_by_user_id,
+                        principalTable: "users",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_digitization_batches_users_entered_by_user_id",
+                        column: x => x.entered_by_user_id,
+                        principalTable: "users",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_digitization_batches_users_verified_by_user_id",
+                        column: x => x.verified_by_user_id,
+                        principalTable: "users",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "digitization_events",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false, defaultValueSql: "gen_random_uuid()"),
+                    batch_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    event_type = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
+                    actor_user_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    occurred_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()"),
+                    metadata_json = table.Column<string>(type: "jsonb", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_digitization_events", x => x.id);
+                    table.CheckConstraint("chk_digitization_events_event_type", "event_type IN ('uploaded', 'entry_started', 'submitted_for_verification', 'rejected', 'verified', 'verified_pending_clinical', 'awaiting_clinical_approval', 'approved', 'promoted', 'live_capture_attested', 'correction_requested', 'verification_failed', 'superseded', 'correction_promoted', 'correction_uploaded', 'promotion_retry_succeeded', 'promotion_retry_failed', 'promotion_retry_exhausted', 'promotion_failed')");
+                    table.ForeignKey(
+                        name: "FK_digitization_events_digitization_batches_batch_id",
+                        column: x => x.batch_id,
+                        principalTable: "digitization_batches",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_digitization_events_users_actor_user_id",
+                        column: x => x.actor_user_id,
+                        principalTable: "users",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "draft_encounters",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false, defaultValueSql: "gen_random_uuid()"),
+                    batch_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    admission_date = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    department = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: true),
+                    room_bed = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: true),
+                    admission_reason = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: true),
+                    discharge_diagnosis = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: true),
+                    status = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: true),
+                    created_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()"),
+                    updated_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_draft_encounters", x => x.id);
+                    table.CheckConstraint("chk_draft_encounters_department", "department IS NULL OR department IN ('Emergency Department', 'Internal Medicine', 'General Medicine', 'Surgery', 'ICU', 'NICU', 'Medical-Surgical', 'Outpatient Clinic', 'Pediatrics', 'Obstetrics & Gynecology', 'Labor & Delivery', 'Cardiology', 'Orthopedics', 'Neurology', 'Oncology', 'Radiology', 'Laboratory', 'Psychiatry', 'Physical Therapy', 'Anesthesiology')");
+                    table.ForeignKey(
+                        name: "FK_draft_encounters_digitization_batches_batch_id",
+                        column: x => x.batch_id,
+                        principalTable: "digitization_batches",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "draft_observations",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false, defaultValueSql: "gen_random_uuid()"),
+                    batch_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    observation_code = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
+                    value = table.Column<decimal>(type: "numeric(10,3)", nullable: false),
+                    unit = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false),
+                    recorded_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false),
+                    note = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: true),
+                    created_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_draft_observations", x => x.id);
+                    table.ForeignKey(
+                        name: "FK_draft_observations_digitization_batches_batch_id",
+                        column: x => x.batch_id,
+                        principalTable: "digitization_batches",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "draft_patients",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false, defaultValueSql: "gen_random_uuid()"),
+                    batch_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    full_name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: true),
+                    date_of_birth = table.Column<DateOnly>(type: "date", nullable: true),
+                    sex = table.Column<string>(type: "character varying(10)", maxLength: 10, nullable: true),
+                    blood_type = table.Column<string>(type: "character varying(10)", maxLength: 10, nullable: true),
+                    emergency_contact = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: true),
+                    allergies_json = table.Column<string>(type: "jsonb", nullable: true),
+                    no_known_allergies = table.Column<bool>(type: "boolean", nullable: false, defaultValue: false),
+                    medications_json = table.Column<string>(type: "jsonb", nullable: true),
+                    no_active_medications = table.Column<bool>(type: "boolean", nullable: false, defaultValue: false),
+                    created_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()"),
+                    updated_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_draft_patients", x => x.id);
+                    table.CheckConstraint("chk_draft_patients_blood_type", "blood_type IS NULL OR blood_type IN ('A+', 'A-', 'B+', 'B-', 'AB+', 'AB-', 'O+', 'O-')");
+                    table.ForeignKey(
+                        name: "FK_draft_patients_digitization_batches_batch_id",
+                        column: x => x.batch_id,
+                        principalTable: "digitization_batches",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "scanned_documents",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false, defaultValueSql: "gen_random_uuid()"),
+                    batch_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    object_key = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: false),
+                    sha256 = table.Column<string>(type: "character varying(64)", maxLength: 64, nullable: false),
+                    content_type = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: false),
+                    file_size_bytes = table.Column<long>(type: "bigint", nullable: false),
+                    uploaded_at = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: false, defaultValueSql: "NOW()")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_scanned_documents", x => x.id);
+                    table.ForeignKey(
+                        name: "FK_scanned_documents_digitization_batches_batch_id",
+                        column: x => x.batch_id,
+                        principalTable: "digitization_batches",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_digitization_batches_approved_by_user_id",
+                table: "digitization_batches",
+                column: "approved_by_user_id");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_digitization_batches_document_sha256_patient_id_created_at",
+                table: "digitization_batches",
+                columns: new[] { "document_sha256", "patient_id", "created_at" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_digitization_batches_entered_by_user_id",
+                table: "digitization_batches",
+                column: "entered_by_user_id");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_digitization_batches_status",
+                table: "digitization_batches",
+                column: "status");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_digitization_batches_supersedes_batch_id",
+                table: "digitization_batches",
+                column: "supersedes_batch_id",
+                filter: "supersedes_batch_id IS NOT NULL");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_digitization_batches_verified_by_user_id",
+                table: "digitization_batches",
+                column: "verified_by_user_id");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_digitization_events_actor_user_id",
+                table: "digitization_events",
+                column: "actor_user_id");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_digitization_events_batch_id_occurred_at",
+                table: "digitization_events",
+                columns: new[] { "batch_id", "occurred_at" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_draft_encounters_batch_id",
+                table: "draft_encounters",
+                column: "batch_id",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_draft_observations_batch_id_observation_code",
+                table: "draft_observations",
+                columns: new[] { "batch_id", "observation_code" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_draft_patients_batch_id",
+                table: "draft_patients",
+                column: "batch_id",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_scanned_documents_batch_id",
+                table: "scanned_documents",
+                column: "batch_id",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_scanned_documents_sha256",
+                table: "scanned_documents",
+                column: "sha256");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_users_username",
+                table: "users",
+                column: "username",
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "digitization_events");
+
+            migrationBuilder.DropTable(
+                name: "draft_encounters");
+
+            migrationBuilder.DropTable(
+                name: "draft_observations");
+
+            migrationBuilder.DropTable(
+                name: "draft_patients");
+
+            migrationBuilder.DropTable(
+                name: "scanned_documents");
+
+            migrationBuilder.DropTable(
+                name: "digitization_batches");
+
+            migrationBuilder.DropTable(
+                name: "users");
+        }
+    }
+}
@@ -0,0 +1,598 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace VigilCareRecordsAPI.Data.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20260625195908_InitialSchema")]
+    partial class InitialSchema
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.4")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("DigitizationBatch", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid?>("ApprovedByUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("approved_by_user_id");
+
+                    b.Property<string>("BatchType")
+                        .IsRequired()
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)")
+                        .HasColumnName("batch_type");
+
+                    b.Property<bool>("ClinicianAttestation")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("clinician_attestation");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("DocumentRef")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("document_ref");
+
+                    b.Property<string>("DocumentSha256")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)")
+                        .HasColumnName("document_sha256");
+
+                    b.Property<bool>("EnableRetroactiveAlerts")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("enable_retroactive_alerts");
+
+                    b.Property<Guid?>("EncounterDraftId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("encounter_draft_id");
+
+                    b.Property<Guid?>("EnteredByUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("entered_by_user_id");
+
+                    b.Property<Guid?>("PatientId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("patient_id");
+
+                    b.Property<DateTimeOffset?>("PromotedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("promoted_at");
+
+                    b.Property<Guid?>("PromotionEncounterId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("promotion_encounter_id");
+
+                    b.Property<string>("RejectionReason")
+                        .HasColumnType("text")
+                        .HasColumnName("rejection_reason");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)")
+                        .HasColumnName("status")
+                        .HasDefaultValueSql("'UPLOADED'");
+
+                    b.Property<Guid?>("SupersedesBatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("supersedes_batch_id");
+
+                    b.Property<string>("Track")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasColumnName("track")
+                        .HasDefaultValueSql("'BACKFILL'");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<Guid?>("VerifiedByUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("verified_by_user_id");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ApprovedByUserId");
+
+                    b.HasIndex("EnteredByUserId");
+
+                    b.HasIndex("Status");
+
+                    b.HasIndex("SupersedesBatchId")
+                        .HasFilter("supersedes_batch_id IS NOT NULL");
+
+                    b.HasIndex("VerifiedByUserId");
+
+                    b.HasIndex("DocumentSha256", "PatientId", "CreatedAt");
+
+                    b.ToTable("digitization_batches", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_batches_batch_type", "batch_type IN ('PATIENT_REGISTRATION', 'ENCOUNTER_SUMMARY', 'VITALS_SHEET', 'LAB_RESULTS', 'MEDICATION_LIST', 'ALLERGY_UPDATE', 'MIXED')");
+
+                            t.HasCheckConstraint("chk_batches_status", "status IN ('UPLOADED', 'IN_ENTRY', 'PENDING_VERIFICATION', 'REJECTED', 'VERIFIED', 'AWAITING_CLINICAL_APPROVAL', 'APPROVED', 'PROMOTED')");
+
+                            t.HasCheckConstraint("chk_batches_track", "track IN ('BACKFILL', 'LIVE_CAPTURE')");
+                        });
+                });
+
+            modelBuilder.Entity("DigitizationEvent", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid>("ActorUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("actor_user_id");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<string>("EventType")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("event_type");
+
+                    b.Property<string>("MetadataJson")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("metadata_json");
+
+                    b.Property<DateTimeOffset>("OccurredAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("occurred_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ActorUserId");
+
+                    b.HasIndex("BatchId", "OccurredAt");
+
+                    b.ToTable("digitization_events", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_digitization_events_event_type", "event_type IN ('uploaded', 'entry_started', 'submitted_for_verification', 'rejected', 'verified', 'verified_pending_clinical', 'awaiting_clinical_approval', 'approved', 'promoted', 'live_capture_attested', 'correction_requested', 'verification_failed', 'superseded', 'correction_promoted', 'correction_uploaded', 'promotion_retry_succeeded', 'promotion_retry_failed', 'promotion_retry_exhausted', 'promotion_failed')");
+                        });
+                });
+
+            modelBuilder.Entity("DraftEncounter", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<DateTimeOffset?>("AdmissionDate")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("admission_date");
+
+                    b.Property<string>("AdmissionReason")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("admission_reason");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("Department")
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("department");
+
+                    b.Property<string>("DischargeDiagnosis")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("discharge_diagnosis");
+
+                    b.Property<string>("RoomBed")
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("room_bed");
+
+                    b.Property<string>("Status")
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasColumnName("status");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId")
+                        .IsUnique();
+
+                    b.ToTable("draft_encounters", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_draft_encounters_department", "department IS NULL OR department IN ('Emergency Department', 'Internal Medicine', 'General Medicine', 'Surgery', 'ICU', 'NICU', 'Medical-Surgical', 'Outpatient Clinic', 'Pediatrics', 'Obstetrics & Gynecology', 'Labor & Delivery', 'Cardiology', 'Orthopedics', 'Neurology', 'Oncology', 'Radiology', 'Laboratory', 'Psychiatry', 'Physical Therapy', 'Anesthesiology')");
+                        });
+                });
+
+            modelBuilder.Entity("DraftObservation", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("Note")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("note");
+
+                    b.Property<string>("ObservationCode")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("observation_code");
+
+                    b.Property<DateTimeOffset>("RecordedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("recorded_at");
+
+                    b.Property<string>("Unit")
+                        .IsRequired()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasColumnName("unit");
+
+                    b.Property<decimal>("Value")
+                        .HasColumnType("decimal(10,3)")
+                        .HasColumnName("value");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId", "ObservationCode");
+
+                    b.ToTable("draft_observations", (string)null);
+                });
+
+            modelBuilder.Entity("DraftPatient", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<string>("AllergiesJson")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("allergies_json");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<string>("BloodType")
+                        .HasMaxLength(10)
+                        .HasColumnType("character varying(10)")
+                        .HasColumnName("blood_type");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<DateOnly?>("DateOfBirth")
+                        .HasColumnType("date")
+                        .HasColumnName("date_of_birth");
+
+                    b.Property<string>("EmergencyContact")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("emergency_contact");
+
+                    b.Property<string>("FullName")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("full_name");
+
+                    b.Property<string>("MedicationsJson")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("medications_json");
+
+                    b.Property<bool>("NoActiveMedications")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("no_active_medications");
+
+                    b.Property<bool>("NoKnownAllergies")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("no_known_allergies");
+
+                    b.Property<string>("Sex")
+                        .HasMaxLength(10)
+                        .HasColumnType("character varying(10)")
+                        .HasColumnName("sex");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId")
+                        .IsUnique();
+
+                    b.ToTable("draft_patients", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_draft_patients_blood_type", "blood_type IS NULL OR blood_type IN ('A+', 'A-', 'B+', 'B-', 'AB+', 'AB-', 'O+', 'O-')");
+                        });
+                });
+
+            modelBuilder.Entity("ScannedDocument", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<string>("ContentType")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("content_type");
+
+                    b.Property<long>("FileSizeBytes")
+                        .HasColumnType("bigint")
+                        .HasColumnName("file_size_bytes");
+
+                    b.Property<string>("ObjectKey")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("object_key");
+
+                    b.Property<string>("Sha256")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)")
+                        .HasColumnName("sha256");
+
+                    b.Property<DateTimeOffset>("UploadedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("uploaded_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId")
+                        .IsUnique();
+
+                    b.HasIndex("Sha256");
+
+                    b.ToTable("scanned_documents", (string)null);
+                });
+
+            modelBuilder.Entity("User", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("FullName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("full_name");
+
+                    b.Property<bool>("IsActive")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(true)
+                        .HasColumnName("is_active");
+
+                    b.Property<string>("PasswordHash")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("password_hash");
+
+                    b.Property<string>("Role")
+                        .IsRequired()
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)")
+                        .HasColumnName("role");
+
+                    b.Property<string>("Username")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("username");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Username")
+                        .IsUnique();
+
+                    b.ToTable("users", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_users_role", "role IN ('INTAKE_CLERK', 'DATA_ENTRY_CLERK', 'VERIFIER', 'CLINICAL_APPROVER', 'CLINICIAN', 'ADMINISTRATOR')");
+                        });
+                });
+
+            modelBuilder.Entity("DigitizationBatch", b =>
+                {
+                    b.HasOne("User", "ApprovedByUser")
+                        .WithMany()
+                        .HasForeignKey("ApprovedByUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.HasOne("User", "EnteredByUser")
+                        .WithMany()
+                        .HasForeignKey("EnteredByUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.HasOne("User", "VerifiedByUser")
+                        .WithMany()
+                        .HasForeignKey("VerifiedByUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("ApprovedByUser");
+
+                    b.Navigation("EnteredByUser");
+
+                    b.Navigation("VerifiedByUser");
+                });
+
+            modelBuilder.Entity("DigitizationEvent", b =>
+                {
+                    b.HasOne("User", "Actor")
+                        .WithMany()
+                        .HasForeignKey("ActorUserId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithMany("Events")
+                        .HasForeignKey("BatchId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Actor");
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DraftEncounter", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithOne("DraftEncounter")
+                        .HasForeignKey("DraftEncounter", "BatchId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DraftObservation", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithMany("DraftObservations")
+                        .HasForeignKey("BatchId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DraftPatient", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithOne("DraftPatient")
+                        .HasForeignKey("DraftPatient", "BatchId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("ScannedDocument", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithOne("Document")
+                        .HasForeignKey("ScannedDocument", "BatchId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DigitizationBatch", b =>
+                {
+                    b.Navigation("Document");
+
+                    b.Navigation("DraftEncounter");
+
+                    b.Navigation("DraftObservations");
+
+                    b.Navigation("DraftPatient");
+
+                    b.Navigation("Events");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace VigilCareRecordsAPI.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class InitialSchema : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}
@@ -0,0 +1,595 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace VigilCareRecordsAPI.Data.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    partial class AppDbContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.4")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("DigitizationBatch", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid?>("ApprovedByUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("approved_by_user_id");
+
+                    b.Property<string>("BatchType")
+                        .IsRequired()
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)")
+                        .HasColumnName("batch_type");
+
+                    b.Property<bool>("ClinicianAttestation")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("clinician_attestation");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("DocumentRef")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("document_ref");
+
+                    b.Property<string>("DocumentSha256")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)")
+                        .HasColumnName("document_sha256");
+
+                    b.Property<bool>("EnableRetroactiveAlerts")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("enable_retroactive_alerts");
+
+                    b.Property<Guid?>("EncounterDraftId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("encounter_draft_id");
+
+                    b.Property<Guid?>("EnteredByUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("entered_by_user_id");
+
+                    b.Property<Guid?>("PatientId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("patient_id");
+
+                    b.Property<DateTimeOffset?>("PromotedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("promoted_at");
+
+                    b.Property<Guid?>("PromotionEncounterId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("promotion_encounter_id");
+
+                    b.Property<string>("RejectionReason")
+                        .HasColumnType("text")
+                        .HasColumnName("rejection_reason");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)")
+                        .HasColumnName("status")
+                        .HasDefaultValueSql("'UPLOADED'");
+
+                    b.Property<Guid?>("SupersedesBatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("supersedes_batch_id");
+
+                    b.Property<string>("Track")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasColumnName("track")
+                        .HasDefaultValueSql("'BACKFILL'");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<Guid?>("VerifiedByUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("verified_by_user_id");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ApprovedByUserId");
+
+                    b.HasIndex("EnteredByUserId");
+
+                    b.HasIndex("Status");
+
+                    b.HasIndex("SupersedesBatchId")
+                        .HasFilter("supersedes_batch_id IS NOT NULL");
+
+                    b.HasIndex("VerifiedByUserId");
+
+                    b.HasIndex("DocumentSha256", "PatientId", "CreatedAt");
+
+                    b.ToTable("digitization_batches", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_batches_batch_type", "batch_type IN ('PATIENT_REGISTRATION', 'ENCOUNTER_SUMMARY', 'VITALS_SHEET', 'LAB_RESULTS', 'MEDICATION_LIST', 'ALLERGY_UPDATE', 'MIXED')");
+
+                            t.HasCheckConstraint("chk_batches_status", "status IN ('UPLOADED', 'IN_ENTRY', 'PENDING_VERIFICATION', 'REJECTED', 'VERIFIED', 'AWAITING_CLINICAL_APPROVAL', 'APPROVED', 'PROMOTED')");
+
+                            t.HasCheckConstraint("chk_batches_track", "track IN ('BACKFILL', 'LIVE_CAPTURE')");
+                        });
+                });
+
+            modelBuilder.Entity("DigitizationEvent", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid>("ActorUserId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("actor_user_id");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<string>("EventType")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("event_type");
+
+                    b.Property<string>("MetadataJson")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("metadata_json");
+
+                    b.Property<DateTimeOffset>("OccurredAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("occurred_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ActorUserId");
+
+                    b.HasIndex("BatchId", "OccurredAt");
+
+                    b.ToTable("digitization_events", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_digitization_events_event_type", "event_type IN ('uploaded', 'entry_started', 'submitted_for_verification', 'rejected', 'verified', 'verified_pending_clinical', 'awaiting_clinical_approval', 'approved', 'promoted', 'live_capture_attested', 'correction_requested', 'verification_failed', 'superseded', 'correction_promoted', 'correction_uploaded', 'promotion_retry_succeeded', 'promotion_retry_failed', 'promotion_retry_exhausted', 'promotion_failed')");
+                        });
+                });
+
+            modelBuilder.Entity("DraftEncounter", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<DateTimeOffset?>("AdmissionDate")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("admission_date");
+
+                    b.Property<string>("AdmissionReason")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("admission_reason");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("Department")
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("department");
+
+                    b.Property<string>("DischargeDiagnosis")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("discharge_diagnosis");
+
+                    b.Property<string>("RoomBed")
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("room_bed");
+
+                    b.Property<string>("Status")
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasColumnName("status");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId")
+                        .IsUnique();
+
+                    b.ToTable("draft_encounters", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_draft_encounters_department", "department IS NULL OR department IN ('Emergency Department', 'Internal Medicine', 'General Medicine', 'Surgery', 'ICU', 'NICU', 'Medical-Surgical', 'Outpatient Clinic', 'Pediatrics', 'Obstetrics & Gynecology', 'Labor & Delivery', 'Cardiology', 'Orthopedics', 'Neurology', 'Oncology', 'Radiology', 'Laboratory', 'Psychiatry', 'Physical Therapy', 'Anesthesiology')");
+                        });
+                });
+
+            modelBuilder.Entity("DraftObservation", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("Note")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("note");
+
+                    b.Property<string>("ObservationCode")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("observation_code");
+
+                    b.Property<DateTimeOffset>("RecordedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("recorded_at");
+
+                    b.Property<string>("Unit")
+                        .IsRequired()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasColumnName("unit");
+
+                    b.Property<decimal>("Value")
+                        .HasColumnType("decimal(10,3)")
+                        .HasColumnName("value");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId", "ObservationCode");
+
+                    b.ToTable("draft_observations", (string)null);
+                });
+
+            modelBuilder.Entity("DraftPatient", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<string>("AllergiesJson")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("allergies_json");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<string>("BloodType")
+                        .HasMaxLength(10)
+                        .HasColumnType("character varying(10)")
+                        .HasColumnName("blood_type");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<DateOnly?>("DateOfBirth")
+                        .HasColumnType("date")
+                        .HasColumnName("date_of_birth");
+
+                    b.Property<string>("EmergencyContact")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("emergency_contact");
+
+                    b.Property<string>("FullName")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("full_name");
+
+                    b.Property<string>("MedicationsJson")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("medications_json");
+
+                    b.Property<bool>("NoActiveMedications")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("no_active_medications");
+
+                    b.Property<bool>("NoKnownAllergies")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("no_known_allergies");
+
+                    b.Property<string>("Sex")
+                        .HasMaxLength(10)
+                        .HasColumnType("character varying(10)")
+                        .HasColumnName("sex");
+
+                    b.Property<DateTimeOffset>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId")
+                        .IsUnique();
+
+                    b.ToTable("draft_patients", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_draft_patients_blood_type", "blood_type IS NULL OR blood_type IN ('A+', 'A-', 'B+', 'B-', 'AB+', 'AB-', 'O+', 'O-')");
+                        });
+                });
+
+            modelBuilder.Entity("ScannedDocument", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<Guid>("BatchId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("batch_id");
+
+                    b.Property<string>("ContentType")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("content_type");
+
+                    b.Property<long>("FileSizeBytes")
+                        .HasColumnType("bigint")
+                        .HasColumnName("file_size_bytes");
+
+                    b.Property<string>("ObjectKey")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("object_key");
+
+                    b.Property<string>("Sha256")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("character varying(64)")
+                        .HasColumnName("sha256");
+
+                    b.Property<DateTimeOffset>("UploadedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("uploaded_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BatchId")
+                        .IsUnique();
+
+                    b.HasIndex("Sha256");
+
+                    b.ToTable("scanned_documents", (string)null);
+                });
+
+            modelBuilder.Entity("User", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id")
+                        .HasDefaultValueSql("gen_random_uuid()");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("NOW()");
+
+                    b.Property<string>("FullName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("full_name");
+
+                    b.Property<bool>("IsActive")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(true)
+                        .HasColumnName("is_active");
+
+                    b.Property<string>("PasswordHash")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("password_hash");
+
+                    b.Property<string>("Role")
+                        .IsRequired()
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)")
+                        .HasColumnName("role");
+
+                    b.Property<string>("Username")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("username");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Username")
+                        .IsUnique();
+
+                    b.ToTable("users", null, t =>
+                        {
+                            t.HasCheckConstraint("chk_users_role", "role IN ('INTAKE_CLERK', 'DATA_ENTRY_CLERK', 'VERIFIER', 'CLINICAL_APPROVER', 'CLINICIAN', 'ADMINISTRATOR')");
+                        });
+                });
+
+            modelBuilder.Entity("DigitizationBatch", b =>
+                {
+                    b.HasOne("User", "ApprovedByUser")
+                        .WithMany()
+                        .HasForeignKey("ApprovedByUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.HasOne("User", "EnteredByUser")
+                        .WithMany()
+                        .HasForeignKey("EnteredByUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.HasOne("User", "VerifiedByUser")
+                        .WithMany()
+                        .HasForeignKey("VerifiedByUserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("ApprovedByUser");
+
+                    b.Navigation("EnteredByUser");
+
+                    b.Navigation("VerifiedByUser");
+                });
+
+            modelBuilder.Entity("DigitizationEvent", b =>
+                {
+                    b.HasOne("User", "Actor")
+                        .WithMany()
+                        .HasForeignKey("ActorUserId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithMany("Events")
+                        .HasForeignKey("BatchId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Actor");
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DraftEncounter", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithOne("DraftEncounter")
+                        .HasForeignKey("DraftEncounter", "BatchId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DraftObservation", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithMany("DraftObservations")
+                        .HasForeignKey("BatchId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DraftPatient", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithOne("DraftPatient")
+                        .HasForeignKey("DraftPatient", "BatchId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("ScannedDocument", b =>
+                {
+                    b.HasOne("DigitizationBatch", "Batch")
+                        .WithOne("Document")
+                        .HasForeignKey("ScannedDocument", "BatchId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Batch");
+                });
+
+            modelBuilder.Entity("DigitizationBatch", b =>
+                {
+                    b.Navigation("Document");
+
+                    b.Navigation("DraftEncounter");
+
+                    b.Navigation("DraftObservations");
+
+                    b.Navigation("DraftPatient");
+
+                    b.Navigation("Events");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
@@ -0,0 +1,39 @@
+using Microsoft.EntityFrameworkCore;
+
+public static class DataSeeder
+{
+    public static async Task SeedAsync(AppDbContext db)
+    {
+        if (await db.Users.AnyAsync()) return;
+
+        var users = new[]
+        {
+            CreateUser("intake1", "Intake Clerk 1", UserRole.IntakeClerk),
+            CreateUser("intake2", "Intake Clerk 2", UserRole.IntakeClerk),
+            CreateUser("entry1", "Entry Clerk 1", UserRole.DataEntryClerk),
+            CreateUser("entry2", "Entry Clerk 2", UserRole.DataEntryClerk),
+            CreateUser("verifier1", "Verifier 1", UserRole.Verifier),
+            CreateUser("verifier2", "Verifier 2", UserRole.Verifier),
+            CreateUser("approver1", "Clinical Approver 1", UserRole.ClinicalApprover),
+            CreateUser("approver2", "Clinical Approver 2", UserRole.ClinicalApprover),
+            CreateUser("clinician1", "Dr. Tanaka", UserRole.Clinician),
+            CreateUser("clinician2", "Dr. Chen", UserRole.Clinician),
+            CreateUser("admin1", "Administrator 1", UserRole.Administrator),
+            CreateUser("admin2", "Administrator 2", UserRole.Administrator),
+        };
+
+        db.Users.AddRange(users);
+        await db.SaveChangesAsync();
+    }
+
+    private static User CreateUser(string username, string fullName, UserRole role) => new()
+    {
+        Id = Guid.NewGuid(),
+        Username = username,
+        PasswordHash = BCrypt.Net.BCrypt.HashPassword("password"),
+        FullName = fullName,
+        Role = role,
+        IsActive = true,
+        CreatedAt = DateTimeOffset.UtcNow
+    };
+}
@@ -0,0 +1,31 @@
+public class DigitizationBatch
+{
+    public Guid Id { get; set; }
+    public BatchStatus Status { get; set; }
+    public BatchType BatchType { get; set; }
+    public BatchTrack Track { get; set; }
+    public Guid? PatientId { get; set; }
+    public Guid? EncounterDraftId { get; set; }
+    public string DocumentRef { get; set; } = null!;
+    public string DocumentSha256 { get; set; } = null!;
+    public bool EnableRetroactiveAlerts { get; set; }
+    public Guid? EnteredByUserId { get; set; }
+    public Guid? VerifiedByUserId { get; set; }
+    public Guid? ApprovedByUserId { get; set; }
+    public string? RejectionReason { get; set; }
+    public DateTimeOffset? PromotedAt { get; set; }
+    public Guid? PromotionEncounterId { get; set; }
+    public Guid? SupersedesBatchId { get; set; }
+    public bool ClinicianAttestation { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+    public DateTimeOffset UpdatedAt { get; set; }
+
+    public User? EnteredByUser { get; set; }
+    public User? VerifiedByUser { get; set; }
+    public User? ApprovedByUser { get; set; }
+    public ScannedDocument? Document { get; set; }
+    public DraftPatient? DraftPatient { get; set; }
+    public DraftEncounter? DraftEncounter { get; set; }
+    public ICollection<DraftObservation> DraftObservations { get; set; } = new List<DraftObservation>();
+    public ICollection<DigitizationEvent> Events { get; set; } = new List<DigitizationEvent>();
+}
@@ -0,0 +1,12 @@
+public class DigitizationEvent
+{
+    public Guid Id { get; set; }
+    public Guid BatchId { get; set; }
+    public DigitizationEventType EventType { get; set; }
+    public Guid ActorUserId { get; set; }
+    public DateTimeOffset OccurredAt { get; set; }
+    public string? MetadataJson { get; set; }
+
+    public DigitizationBatch Batch { get; set; } = null!;
+    public User Actor { get; set; } = null!;
+}
@@ -0,0 +1,15 @@
+public class DraftEncounter
+{
+    public Guid Id { get; set; }
+    public Guid BatchId { get; set; }
+    public DateTimeOffset? AdmissionDate { get; set; }
+    public Department? Department { get; set; }
+    public string? RoomBed { get; set; }
+    public string? AdmissionReason { get; set; }
+    public string? DischargeDiagnosis { get; set; }
+    public string? Status { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+    public DateTimeOffset UpdatedAt { get; set; }
+
+    public DigitizationBatch Batch { get; set; } = null!;
+}
@@ -0,0 +1,13 @@
+public class DraftObservation
+{
+    public Guid Id { get; set; }
+    public Guid BatchId { get; set; }
+    public string ObservationCode { get; set; } = null!;
+    public decimal Value { get; set; }
+    public string Unit { get; set; } = null!;
+    public DateTimeOffset RecordedAt { get; set; }
+    public string? Note { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+
+    public DigitizationBatch Batch { get; set; } = null!;
+}
@@ -0,0 +1,18 @@
+public class DraftPatient
+{
+    public Guid Id { get; set; }
+    public Guid BatchId { get; set; }
+    public string? FullName { get; set; }
+    public DateOnly? DateOfBirth { get; set; }
+    public string? Sex { get; set; }
+    public BloodType? BloodType { get; set; }
+    public string? EmergencyContact { get; set; }
+    public string? AllergiesJson { get; set; }
+    public bool NoKnownAllergies { get; set; }
+    public string? MedicationsJson { get; set; }
+    public bool NoActiveMedications { get; set; }
+    public DateTimeOffset CreatedAt { get; set; }
+    public DateTimeOffset UpdatedAt { get; set; }
+
+    public DigitizationBatch Batch { get; set; } = null!;
+}
@@ -0,0 +1,12 @@
+public class ScannedDocument
+{
+    public Guid Id { get; set; }
+    public Guid BatchId { get; set; }
+    public string ObjectKey { get; set; } = null!;
+    public string Sha256 { get; set; } = null!;
+    public string ContentType { get; set; } = null!;
+    public long FileSizeBytes { get; set; }
+    public DateTimeOffset UploadedAt { get; set; }
+
+    public DigitizationBatch Batch { get; set; } = null!;
+}
@@ -0,0 +1,10 @@
+public class User
+{
+    public Guid Id { get; set; }
+    public string Username { get; set; } = null!;
+    public string PasswordHash { get; set; } = null!;
+    public string FullName { get; set; } = null!;
+    public UserRole Role { get; set; }
+    public bool IsActive { get; set; } = true;
+    public DateTimeOffset CreatedAt { get; set; }
+}
@@ -0,0 +1,30 @@
+public enum BatchStatus { Uploaded, InEntry, PendingVerification, Rejected, Verified, AwaitingClinicalApproval, Approved, Promoted }
+
+public static class BatchStatusExtensions
+{
+    public static string ToDbString(this BatchStatus s) => s switch
+    {
+        BatchStatus.Uploaded                 => "UPLOADED",
+        BatchStatus.InEntry                  => "IN_ENTRY",
+        BatchStatus.PendingVerification      => "PENDING_VERIFICATION",
+        BatchStatus.Rejected                 => "REJECTED",
+        BatchStatus.Verified                 => "VERIFIED",
+        BatchStatus.AwaitingClinicalApproval => "AWAITING_CLINICAL_APPROVAL",
+        BatchStatus.Approved                 => "APPROVED",
+        BatchStatus.Promoted                 => "PROMOTED",
+        _ => throw new ArgumentOutOfRangeException(nameof(s))
+    };
+
+    public static BatchStatus FromDbString(string v) => v switch
+    {
+        "UPLOADED"                   => BatchStatus.Uploaded,
+        "IN_ENTRY"                   => BatchStatus.InEntry,
+        "PENDING_VERIFICATION"       => BatchStatus.PendingVerification,
+        "REJECTED"                   => BatchStatus.Rejected,
+        "VERIFIED"                   => BatchStatus.Verified,
+        "AWAITING_CLINICAL_APPROVAL" => BatchStatus.AwaitingClinicalApproval,
+        "APPROVED"                   => BatchStatus.Approved,
+        "PROMOTED"                   => BatchStatus.Promoted,
+        _ => throw new ArgumentOutOfRangeException(nameof(v), $"Unknown batch status: '{v}'")
+    };
+}
@@ -0,0 +1,18 @@
+public enum BatchTrack { Backfill, LiveCapture }
+
+public static class BatchTrackExtensions
+{
+    public static string ToDbString(this BatchTrack t) => t switch
+    {
+        BatchTrack.Backfill    => "BACKFILL",
+        BatchTrack.LiveCapture => "LIVE_CAPTURE",
+        _ => throw new ArgumentOutOfRangeException(nameof(t))
+    };
+
+    public static BatchTrack FromDbString(string v) => v switch
+    {
+        "BACKFILL"     => BatchTrack.Backfill,
+        "LIVE_CAPTURE" => BatchTrack.LiveCapture,
+        _ => throw new ArgumentOutOfRangeException(nameof(v), $"Unknown batch track: '{v}'")
+    };
+}
@@ -0,0 +1,28 @@
+public enum BatchType { PatientRegistration, EncounterSummary, VitalsSheet, LabResults, MedicationList, AllergyUpdate, Mixed }
+
+public static class BatchTypeExtensions
+{
+    public static string ToDbString(this BatchType t) => t switch
+    {
+        BatchType.PatientRegistration => "PATIENT_REGISTRATION",
+        BatchType.EncounterSummary    => "ENCOUNTER_SUMMARY",
+        BatchType.VitalsSheet         => "VITALS_SHEET",
+        BatchType.LabResults          => "LAB_RESULTS",
+        BatchType.MedicationList      => "MEDICATION_LIST",
+        BatchType.AllergyUpdate       => "ALLERGY_UPDATE",
+        BatchType.Mixed               => "MIXED",
+        _ => throw new ArgumentOutOfRangeException(nameof(t))
+    };
+
+    public static BatchType FromDbString(string v) => v switch
+    {
+        "PATIENT_REGISTRATION" => BatchType.PatientRegistration,
+        "ENCOUNTER_SUMMARY"    => BatchType.EncounterSummary,
+        "VITALS_SHEET"         => BatchType.VitalsSheet,
+        "LAB_RESULTS"          => BatchType.LabResults,
+        "MEDICATION_LIST"      => BatchType.MedicationList,
+        "ALLERGY_UPDATE"       => BatchType.AllergyUpdate,
+        "MIXED"                => BatchType.Mixed,
+        _ => throw new ArgumentOutOfRangeException(nameof(v), $"Unknown batch type: '{v}'")
+    };
+}
@@ -0,0 +1,37 @@
+public enum BloodType { APos, ANeg, BPos, BNeg, AbPos, AbNeg, OPos, ONeg }
+
+public static class BloodTypeExtensions
+{
+    public static string ToDbString(this BloodType t) => t switch
+    {
+        BloodType.APos  => "A+",
+        BloodType.ANeg  => "A-",
+        BloodType.BPos  => "B+",
+        BloodType.BNeg  => "B-",
+        BloodType.AbPos => "AB+",
+        BloodType.AbNeg => "AB-",
+        BloodType.OPos  => "O+",
+        BloodType.ONeg  => "O-",
+        _ => throw new ArgumentOutOfRangeException(nameof(t))
+    };
+
+    public static BloodType FromDbString(string v) => v switch
+    {
+        "A+"  => BloodType.APos,
+        "A-"  => BloodType.ANeg,
+        "B+"  => BloodType.BPos,
+        "B-"  => BloodType.BNeg,
+        "AB+" => BloodType.AbPos,
+        "AB-" => BloodType.AbNeg,
+        "O+"  => BloodType.OPos,
+        "O-"  => BloodType.ONeg,
+        _ => throw new ArgumentOutOfRangeException(nameof(v), $"Unknown blood type: '{v}'")
+    };
+
+    public static bool TryFromDbString(string? v, out BloodType result)
+    {
+        if (v is null) { result = default; return false; }
+        try { result = FromDbString(v); return true; }
+        catch (ArgumentOutOfRangeException) { result = default; return false; }
+    }
+}
@@ -0,0 +1,83 @@
+public enum Department
+{
+    EmergencyDepartment,
+    InternalMedicine,
+    GeneralMedicine,
+    Surgery,
+    Icu,
+    Nicu,
+    MedSurg,
+    OutpatientClinic,
+    Pediatrics,
+    ObstetricsGynecology,
+    LaborAndDelivery,
+    Cardiology,
+    Orthopedics,
+    Neurology,
+    Oncology,
+    Radiology,
+    Laboratory,
+    Psychiatry,
+    PhysicalTherapy,
+    Anesthesiology
+}
+
+public static class DepartmentExtensions
+{
+    public static string ToDbString(this Department d) => d switch
+    {
+        Department.EmergencyDepartment  => "Emergency Department",
+        Department.InternalMedicine     => "Internal Medicine",
+        Department.GeneralMedicine      => "General Medicine",
+        Department.Surgery              => "Surgery",
+        Department.Icu                  => "ICU",
+        Department.Nicu                 => "NICU",
+        Department.MedSurg              => "Medical-Surgical",
+        Department.OutpatientClinic     => "Outpatient Clinic",
+        Department.Pediatrics           => "Pediatrics",
+        Department.ObstetricsGynecology => "Obstetrics & Gynecology",
+        Department.LaborAndDelivery     => "Labor & Delivery",
+        Department.Cardiology           => "Cardiology",
+        Department.Orthopedics          => "Orthopedics",
+        Department.Neurology            => "Neurology",
+        Department.Oncology             => "Oncology",
+        Department.Radiology            => "Radiology",
+        Department.Laboratory           => "Laboratory",
+        Department.Psychiatry           => "Psychiatry",
+        Department.PhysicalTherapy      => "Physical Therapy",
+        Department.Anesthesiology       => "Anesthesiology",
+        _ => throw new ArgumentOutOfRangeException(nameof(d))
+    };
+
+    public static Department FromDbString(string v) => v switch
+    {
+        "Emergency Department"     => Department.EmergencyDepartment,
+        "Internal Medicine"      => Department.InternalMedicine,
+        "General Medicine"       => Department.GeneralMedicine,
+        "Surgery"                => Department.Surgery,
+        "ICU"                    => Department.Icu,
+        "NICU"                   => Department.Nicu,
+        "Medical-Surgical"       => Department.MedSurg,
+        "Outpatient Clinic"      => Department.OutpatientClinic,
+        "Pediatrics"             => Department.Pediatrics,
+        "Obstetrics & Gynecology" => Department.ObstetricsGynecology,
+        "Labor & Delivery"       => Department.LaborAndDelivery,
+        "Cardiology"             => Department.Cardiology,
+        "Orthopedics"            => Department.Orthopedics,
+        "Neurology"              => Department.Neurology,
+        "Oncology"               => Department.Oncology,
+        "Radiology"              => Department.Radiology,
+        "Laboratory"             => Department.Laboratory,
+        "Psychiatry"             => Department.Psychiatry,
+        "Physical Therapy"       => Department.PhysicalTherapy,
+        "Anesthesiology"         => Department.Anesthesiology,
+        _ => throw new ArgumentOutOfRangeException(nameof(v), $"Unknown department: '{v}'")
+    };
+
+    public static bool TryFromDbString(string? v, out Department result)
+    {
+        if (v is null) { result = default; return false; }
+        try { result = FromDbString(v); return true; }
+        catch (ArgumentOutOfRangeException) { result = default; return false; }
+    }
+}
@@ -0,0 +1,73 @@
+public enum DigitizationEventType
+{
+    Uploaded,
+    EntryStarted,
+    SubmittedForVerification,
+    Rejected,
+    Verified,
+    VerifiedPendingClinical,
+    AwaitingClinicalApproval,
+    Approved,
+    Promoted,
+    LiveCaptureAttested,
+    CorrectionRequested,
+    VerificationFailed,
+    Superseded,
+    CorrectionPromoted,
+    CorrectionUploaded,
+    PromotionRetrySucceeded,
+    PromotionRetryFailed,
+    PromotionRetryExhausted,
+    PromotionFailed
+}
+
+public static class DigitizationEventTypeExtensions
+{
+    public static string ToDbString(this DigitizationEventType t) => t switch
+    {
+        DigitizationEventType.Uploaded                  => "uploaded",
+        DigitizationEventType.EntryStarted              => "entry_started",
+        DigitizationEventType.SubmittedForVerification  => "submitted_for_verification",
+        DigitizationEventType.Rejected                  => "rejected",
+        DigitizationEventType.Verified                  => "verified",
+        DigitizationEventType.VerifiedPendingClinical   => "verified_pending_clinical",
+        DigitizationEventType.AwaitingClinicalApproval  => "awaiting_clinical_approval",
+        DigitizationEventType.Approved                  => "approved",
+        DigitizationEventType.Promoted                  => "promoted",
+        DigitizationEventType.LiveCaptureAttested       => "live_capture_attested",
+        DigitizationEventType.CorrectionRequested       => "correction_requested",
+        DigitizationEventType.VerificationFailed        => "verification_failed",
+        DigitizationEventType.Superseded                => "superseded",
+        DigitizationEventType.CorrectionPromoted        => "correction_promoted",
+        DigitizationEventType.CorrectionUploaded        => "correction_uploaded",
+        DigitizationEventType.PromotionRetrySucceeded     => "promotion_retry_succeeded",
+        DigitizationEventType.PromotionRetryFailed        => "promotion_retry_failed",
+        DigitizationEventType.PromotionRetryExhausted     => "promotion_retry_exhausted",
+        DigitizationEventType.PromotionFailed             => "promotion_failed",
+        _ => throw new ArgumentOutOfRangeException(nameof(t))
+    };
+
+    public static DigitizationEventType FromDbString(string v) => v switch
+    {
+        "uploaded"                   => DigitizationEventType.Uploaded,
+        "entry_started"              => DigitizationEventType.EntryStarted,
+        "submitted_for_verification" => DigitizationEventType.SubmittedForVerification,
+        "rejected"                   => DigitizationEventType.Rejected,
+        "verified"                   => DigitizationEventType.Verified,
+        "verified_pending_clinical"  => DigitizationEventType.VerifiedPendingClinical,
+        "awaiting_clinical_approval" => DigitizationEventType.AwaitingClinicalApproval,
+        "approved"                   => DigitizationEventType.Approved,
+        "promoted"                   => DigitizationEventType.Promoted,
+        "live_capture_attested"      => DigitizationEventType.LiveCaptureAttested,
+        "correction_requested"       => DigitizationEventType.CorrectionRequested,
+        "verification_failed"        => DigitizationEventType.VerificationFailed,
+        "superseded"                 => DigitizationEventType.Superseded,
+        "correction_promoted"        => DigitizationEventType.CorrectionPromoted,
+        "correction_uploaded"        => DigitizationEventType.CorrectionUploaded,
+        "promotion_retry_succeeded"  => DigitizationEventType.PromotionRetrySucceeded,
+        "promotion_retry_failed"     => DigitizationEventType.PromotionRetryFailed,
+        "promotion_retry_exhausted"  => DigitizationEventType.PromotionRetryExhausted,
+        "promotion_failed"           => DigitizationEventType.PromotionFailed,
+        _ => throw new ArgumentOutOfRangeException(nameof(v), $"Unknown digitization event type: '{v}'")
+    };
+}
@@ -0,0 +1,26 @@
+public enum UserRole { IntakeClerk, DataEntryClerk, Verifier, ClinicalApprover, Clinician, Administrator }
+
+public static class UserRoleExtensions
+{
+    public static string ToDbString(this UserRole r) => r switch
+    {
+        UserRole.IntakeClerk      => "INTAKE_CLERK",
+        UserRole.DataEntryClerk   => "DATA_ENTRY_CLERK",
+        UserRole.Verifier         => "VERIFIER",
+        UserRole.ClinicalApprover => "CLINICAL_APPROVER",
+        UserRole.Clinician        => "CLINICIAN",
+        UserRole.Administrator    => "ADMINISTRATOR",
+        _ => throw new ArgumentOutOfRangeException(nameof(r))
+    };
+
+    public static UserRole FromDbString(string v) => v switch
+    {
+        "INTAKE_CLERK"      => UserRole.IntakeClerk,
+        "DATA_ENTRY_CLERK"  => UserRole.DataEntryClerk,
+        "VERIFIER"          => UserRole.Verifier,
+        "CLINICAL_APPROVER" => UserRole.ClinicalApprover,
+        "CLINICIAN"         => UserRole.Clinician,
+        "ADMINISTRATOR"     => UserRole.Administrator,
+        _ => throw new ArgumentOutOfRangeException(nameof(v), $"Unknown user role: '{v}'")
+    };
+}
@@ -0,0 +1,23 @@
+using Serilog.Context;
+
+public sealed class CorrelationIdMiddleware
+{
+    private const string Header = "X-Correlation-Id";
+    private readonly RequestDelegate _next;
+
+    public CorrelationIdMiddleware(RequestDelegate next) => _next = next;
+
+    public async Task InvokeAsync(HttpContext ctx)
+    {
+        var correlationId = ctx.Request.Headers[Header].FirstOrDefault()
+            ?? Guid.NewGuid().ToString();
+
+        ctx.Response.Headers[Header] = correlationId;
+        ctx.Items["CorrelationId"] = correlationId;
+
+        using (LogContext.PushProperty("CorrelationId", correlationId))
+        {
+            await _next(ctx);
+        }
+    }
+}
@@ -0,0 +1,50 @@
+public class ExceptionHandlerMiddleware
+{
+    private readonly RequestDelegate _next;
+    private readonly ILogger<ExceptionHandlerMiddleware> _logger;
+
+    public ExceptionHandlerMiddleware(RequestDelegate next, ILogger<ExceptionHandlerMiddleware> logger)
+    {
+        _next = next;
+        _logger = logger;
+    }
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        try
+        {
+            await _next(context);
+        }
+        catch (NotFoundException ex)
+        {
+            _logger.LogWarning("{Message}", ex.Message);
+            await WriteAsync(context, StatusCodes.Status404NotFound,
+                ApiResponse<object>.Fail(StatusCodes.Status404NotFound, ex.Message, ex.ErrorCode));
+        }
+        catch (ValidationException ex)
+        {
+            _logger.LogWarning("{Message}", ex.Message);
+            await WriteAsync(context, StatusCodes.Status422UnprocessableEntity,
+                ApiResponse<object>.Fail(StatusCodes.Status422UnprocessableEntity, ex.Message, ex.ErrorCode));
+        }
+        catch (ConflictException ex)
+        {
+            _logger.LogWarning("{Message}", ex.Message);
+            await WriteAsync(context, StatusCodes.Status409Conflict,
+                ApiResponse<object>.Fail(StatusCodes.Status409Conflict, ex.Message, ex.ErrorCode));
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Unhandled exception");
+            await WriteAsync(context, StatusCodes.Status500InternalServerError,
+                ApiResponse<object>.Fail(StatusCodes.Status500InternalServerError,
+                    "An unexpected error occurred", "INTERNAL_ERROR"));
+        }
+    }
+
+    private static async Task WriteAsync<T>(HttpContext context, int status, ApiResponse<T> body)
+    {
+        context.Response.StatusCode = status;
+        await context.Response.WriteAsJsonAsync(body);
+    }
+}
@@ -0,0 +1 @@
+public record LoginRequest(string Username, string Password);
@@ -0,0 +1 @@
+public record LoginResponse(string Token, Guid UserId, string Username, string FullName, string Role);
@@ -0,0 +1 @@
+public record AssignBatchRequest(Guid EntryClerkUserId);
@@ -0,0 +1,47 @@
+/// <summary>
+/// API representation of a digitization batch. Hides EF navigation properties
+/// and exposes enum fields as DB string literals.
+/// </summary>
+public record BatchDetailResponse(
+    Guid Id,
+    string Status,
+    string BatchType,
+    string Track,
+    Guid? PatientId,
+    string DocumentRef,
+    string? DocumentUrl,
+    bool EnableRetroactiveAlerts,
+    Guid? EnteredByUserId,
+    Guid? VerifiedByUserId,
+    Guid? ApprovedByUserId,
+    string? RejectionReason,
+    DateTimeOffset? PromotedAt,
+    Guid? PromotionEncounterId,
+    Guid? SupersedesBatchId,
+    bool ClinicianAttestation,
+    DateTimeOffset CreatedAt,
+    DateTimeOffset UpdatedAt
+)
+{
+    public static BatchDetailResponse FromEntity(DigitizationBatch batch, string? documentUrl = null) =>
+        new(
+            batch.Id,
+            batch.Status.ToDbString(),
+            batch.BatchType.ToDbString(),
+            batch.Track.ToDbString(),
+            batch.PatientId,
+            batch.DocumentRef,
+            documentUrl,
+            batch.EnableRetroactiveAlerts,
+            batch.EnteredByUserId,
+            batch.VerifiedByUserId,
+            batch.ApprovedByUserId,
+            batch.RejectionReason,
+            batch.PromotedAt,
+            batch.PromotionEncounterId,
+            batch.SupersedesBatchId,
+            batch.ClinicianAttestation,
+            batch.CreatedAt,
+            batch.UpdatedAt
+        );
+}
@@ -0,0 +1,8 @@
+/// <summary>
+/// Multipart form metadata for batch creation (file is bound separately as <c>IFormFile</c>).
+/// </summary>
+public record CreateBatchRequest(
+    string BatchType,
+    string? Track,
+    Guid? PatientId
+);
@@ -0,0 +1,9 @@
+public record PagedResult<T>(
+    IReadOnlyList<T> Items,
+    int Page,
+    int PageSize,
+    int TotalCount
+)
+{
+    public int TotalPages => (int)Math.Ceiling((double)TotalCount / PageSize);
+}
@@ -0,0 +1,94 @@
+using System.Reflection;
+using System.Text;
+using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.IdentityModel.Tokens;
+using Minio;
+using Serilog;
+
+try
+{
+    
+    var builder = WebApplication.CreateBuilder(args);
+
+    builder.Host.UseSerilog((ctx, cfg) => cfg.ReadFrom.Configuration(ctx.Configuration));
+
+    // Configuration
+    builder.Services.Configure<JwtOptions>(builder.Configuration.GetSection(JwtOptions.Section));
+    builder.Services.Configure<MinioOptions>(builder.Configuration.GetSection(MinioOptions.Section));
+
+    // Database
+    builder.Services.AddDbContext<AppDbContext>(options =>
+        options.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));
+
+    // MinIO
+    var minioOptions = builder.Configuration.GetSection(MinioOptions.Section).Get<MinioOptions>()!;
+    builder.Services.AddSingleton<IMinioClient>(new MinioClient()
+        .WithEndpoint(minioOptions.Endpoint)
+        .WithCredentials(minioOptions.AccessKey, minioOptions.SecretKey)
+        .WithSSL(minioOptions.UseSsl)
+        .Build());
+
+    // JWT Authentication
+    var jwtOptions = builder.Configuration.GetSection(JwtOptions.Section).Get<JwtOptions>()!;
+    builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
+        .AddJwtBearer(options =>
+        {
+            options.TokenValidationParameters = new TokenValidationParameters
+            {
+                ValidateIssuer = true,
+                ValidateAudience = true,
+                ValidateLifetime = true,
+                ValidateIssuerSigningKey = true,
+                ValidIssuer = jwtOptions.Issuer,
+                ValidAudience = jwtOptions.Audience,
+                IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwtOptions.Secret))
+            };
+        });
+    builder.Services.AddAuthorization();
+
+    // Services
+    builder.Services.AddScoped<IAuthService, AuthService>();
+    builder.Services.AddScoped<IBatchService, BatchService>();
+    builder.Services.AddScoped<IDocumentStorageService, DocumentStorageService>();
+
+    builder.Services.AddControllers();
+    builder.Services.AddEndpointsApiExplorer();
+    builder.Services.AddSwaggerGen(c =>
+    {
+        var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
+        c.IncludeXmlComments(Path.Combine(AppContext.BaseDirectory, xmlFile));
+    });
+
+    var app = builder.Build();
+
+    app.UseMiddleware<CorrelationIdMiddleware>();
+    app.UseMiddleware<ExceptionHandlerMiddleware>();
+
+    // Configure the HTTP request pipeline.
+    if (app.Environment.IsDevelopment())
+    {
+        app.UseSwagger();
+        app.UseSwaggerUI();
+    }
+
+    app.UseAuthentication();
+    app.UseAuthorization();
+    app.MapControllers();
+    app.Run();
+
+    using (var scope = app.Services.CreateScope())
+    {
+        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+        await db.Database.MigrateAsync();
+        await DataSeeder.SeedAsync(db);
+    }
+}
+catch (System.Exception)
+{
+    
+    throw;
+}
+
+
+public partial class Program { }
@@ -0,0 +1,41 @@
+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:34859",
+      "sslPort": 44301
+    }
+  },
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "http://localhost:5217",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7223;http://localhost:5217",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}
@@ -0,0 +1,62 @@
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using Microsoft.IdentityModel.Tokens;
+
+public class AuthService : IAuthService
+{
+    private readonly AppDbContext _db;
+    private readonly JwtOptions _jwtOptions;
+
+    public AuthService(AppDbContext db, IOptions<JwtOptions> jwtOptions)
+    {
+        _db = db;
+        _jwtOptions = jwtOptions.Value;
+    }
+
+    public async Task<LoginResponse> LoginAsync(LoginRequest req)
+    {
+        var user = await _db.Users.FirstOrDefaultAsync(u => u.Username == req.Username);
+        if (user is null || !BCrypt.Net.BCrypt.Verify(req.Password, user.PasswordHash))
+            throw new ValidationException("Invalid username or password.", "INVALID_CREDENTIALS");
+
+        if (!user.IsActive)
+            throw new ConflictException("Account is disabled.", "ACCOUNT_DISABLED");
+
+        var token = GenerateJwt(user);
+        return new LoginResponse(token, user.Id, user.Username, user.FullName, user.Role.ToDbString());
+    }
+
+    public async Task<User> GetCurrentUserAsync(Guid userId)
+    {
+        var user = await _db.Users.FindAsync(userId);
+        if (user is null)
+            throw new NotFoundException("User not found.", "USER_NOT_FOUND");
+        return user;
+    }
+
+    private string GenerateJwt(User user)
+    {
+        var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_jwtOptions.Secret));
+        var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
+
+        var claims = new[]
+        {
+            new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()),
+            new Claim(ClaimTypes.Name, user.Username),
+            new Claim(ClaimTypes.Role, user.Role.ToDbString()),
+            new Claim("fullName", user.FullName)
+        };
+
+        var token = new JwtSecurityToken(
+            issuer: _jwtOptions.Issuer,
+            audience: _jwtOptions.Audience,
+            claims: claims,
+            expires: DateTime.UtcNow.AddMinutes(_jwtOptions.ExpiryMinutes),
+            signingCredentials: creds);
+
+        return new JwtSecurityTokenHandler().WriteToken(token);
+    }
+}
@@ -0,0 +1,182 @@
+using System.Text.Json;
+using Microsoft.EntityFrameworkCore;
+using StackExchange.Redis;
+
+public class BatchService : IBatchService
+{
+    private static readonly Dictionary<BatchStatus, HashSet<BatchStatus>> _allowedTransitions = new()
+    {
+        [BatchStatus.Uploaded]                 = new() { BatchStatus.InEntry },
+        [BatchStatus.InEntry]                  = new() { BatchStatus.PendingVerification },
+        [BatchStatus.PendingVerification]      = new() { BatchStatus.Verified, BatchStatus.Rejected, BatchStatus.AwaitingClinicalApproval },
+        [BatchStatus.Rejected]                 = new() { BatchStatus.InEntry },
+        [BatchStatus.Verified]                 = new() { BatchStatus.Approved },
+        [BatchStatus.AwaitingClinicalApproval] = new() { BatchStatus.Approved, BatchStatus.Rejected },
+        [BatchStatus.Approved]                 = new() { BatchStatus.Promoted },
+        [BatchStatus.Promoted]                 = new(),
+    };
+
+    private readonly AppDbContext _db;
+    private readonly IDocumentStorageService _storage;
+    private readonly IConnectionMultiplexer _redis;
+    private readonly ILogger<BatchService> _logger;
+
+    public BatchService(AppDbContext db, IDocumentStorageService storage,
+        IConnectionMultiplexer redis, ILogger<BatchService> logger)
+    {
+        _db = db;
+        _storage = storage;
+        _redis = redis;
+        _logger = logger;
+    }
+
+    public async Task<DigitizationBatch> CreateAsync(
+        Stream fileStream, string contentType, BatchType batchType,
+        BatchTrack track, Guid? patientId, Guid actorUserId)
+    {
+        var (objectKey, sha256, fileSize) = await _storage.UploadAsync(fileStream, contentType, Guid.NewGuid());
+
+        // Duplicate detection: same SHA-256 for same patient within 24 hours.
+        // Cross-patient duplicates (same form scanned for two patients) are allowed.
+        if (patientId.HasValue)
+        {
+            var cutoff = DateTimeOffset.UtcNow.AddHours(-24);
+            var duplicate = await _db.DigitizationBatches.AnyAsync(b =>
+                b.DocumentSha256 == sha256 &&
+                b.PatientId == patientId.Value &&
+                b.CreatedAt >= cutoff);
+
+            if (duplicate)
+                throw new ConflictException(
+                    "A document with the same content was uploaded for this patient within the last 24 hours.",
+                    "DUPLICATE_DOCUMENT");
+        }
+
+        var batchId = Guid.NewGuid();
+        var batch = new DigitizationBatch
+        {
+            Id = batchId,
+            Status = BatchStatus.Uploaded,
+            BatchType = batchType,
+            Track = track,
+            PatientId = patientId,
+            DocumentRef = objectKey,
+            DocumentSha256 = sha256,
+            EnableRetroactiveAlerts = false,
+            CreatedAt = DateTimeOffset.UtcNow,
+            UpdatedAt = DateTimeOffset.UtcNow
+        };
+
+        var document = new ScannedDocument
+        {
+            Id = Guid.NewGuid(),
+            BatchId = batchId,
+            ObjectKey = objectKey,
+            Sha256 = sha256,
+            ContentType = contentType,
+            FileSizeBytes = fileSize,
+            UploadedAt = DateTimeOffset.UtcNow
+        };
+
+        var evt = new DigitizationEvent
+        {
+            Id = Guid.NewGuid(),
+            BatchId = batchId,
+            EventType = DigitizationEventType.Uploaded,
+            ActorUserId = actorUserId,
+            OccurredAt = DateTimeOffset.UtcNow
+        };
+
+        _db.DigitizationBatches.Add(batch);
+        _db.ScannedDocuments.Add(document);
+        _db.DigitizationEvents.Add(evt);
+        await _db.SaveChangesAsync();
+
+        _logger.LogInformation("Batch {BatchId} created with document {ObjectKey}", batchId, objectKey);
+        return batch;
+    }
+
+    public async Task<DigitizationBatch> GetByIdAsync(Guid id)
+    {
+        var batch = await _db.DigitizationBatches
+            .Include(b => b.Document)
+            .Include(b => b.DraftPatient)
+            .Include(b => b.DraftEncounter)
+            .Include(b => b.DraftObservations)
+            .FirstOrDefaultAsync(b => b.Id == id);
+
+        if (batch is null)
+            throw new NotFoundException("Batch not found.", "BATCH_NOT_FOUND");
+
+        return batch;
+    }
+
+    public async Task<PagedResult<DigitizationBatch>> ListAsync(
+        BatchStatus? status, BatchType? batchType, Guid? assignedTo, BatchTrack? track,
+        int page, int pageSize)
+    {
+        var query = _db.DigitizationBatches.AsQueryable();
+
+        if (status.HasValue)
+            query = query.Where(b => b.Status == status.Value);
+        if (batchType.HasValue)
+            query = query.Where(b => b.BatchType == batchType.Value);
+        if (assignedTo.HasValue)
+            query = query.Where(b => b.EnteredByUserId == assignedTo.Value);
+        if (track.HasValue)
+            query = query.Where(b => b.Track == track.Value);
+
+        var total = await query.CountAsync();
+        var items = await query
+            .OrderByDescending(b => b.CreatedAt)
+            .Skip((page - 1) * pageSize)
+            .Take(pageSize)
+            .ToListAsync();
+
+        return new PagedResult<DigitizationBatch>(items, page, pageSize, total);
+    }
+
+    public async Task<DigitizationBatch> AssignAsync(Guid batchId, Guid entryClerkUserId, Guid actorUserId)
+    {
+        var batch = await _db.DigitizationBatches.FindAsync(batchId);
+        if (batch is null)
+            throw new NotFoundException("Batch not found.", "BATCH_NOT_FOUND");
+
+        if (batch.Status != BatchStatus.Uploaded)
+            throw new ConflictException(
+                "Only batches in 'uploaded' status can be assigned.",
+                "ILLEGAL_STATUS_TRANSITION");
+
+        // Redis lock to prevent double-assignment
+        var cache = _redis.GetDatabase();
+        var lockKey = $"batch:assign:{batchId}";
+        var acquired = await cache.StringSetAsync(lockKey, entryClerkUserId.ToString(),
+            TimeSpan.FromHours(1), When.NotExists);
+
+        if (!acquired)
+            throw new ConflictException(
+                "This batch is already assigned to another clerk.",
+                "BATCH_ALREADY_ASSIGNED");
+
+        batch.EnteredByUserId = entryClerkUserId;
+        batch.UpdatedAt = DateTimeOffset.UtcNow;
+
+        _db.DigitizationEvents.Add(new DigitizationEvent
+        {
+            Id = Guid.NewGuid(),
+            BatchId = batchId,
+            EventType = DigitizationEventType.EntryStarted,
+            ActorUserId = actorUserId,
+            OccurredAt = DateTimeOffset.UtcNow,
+            MetadataJson = JsonSerializer.Serialize(new { assignedTo = entryClerkUserId })
+        });
+
+        await _db.SaveChangesAsync();
+        return batch;
+    }
+
+    public BatchStatus[] GetAllowedTransitions(BatchStatus current) =>
+        _allowedTransitions.TryGetValue(current, out var targets)
+            ? targets.ToArray()
+            : Array.Empty<BatchStatus>();
+}
@@ -0,0 +1,67 @@
+using System.Security.Cryptography;
+using Microsoft.Extensions.Options;
+using Minio;
+using Minio.DataModel.Args;
+
+public class DocumentStorageService : IDocumentStorageService
+{
+    private readonly IMinioClient _minio;
+    private readonly MinioOptions _options;
+
+    public DocumentStorageService(IMinioClient minio, IOptions<MinioOptions> options)
+    {
+        _minio = minio;
+        _options = options.Value;
+    }
+
+    public async Task<(string objectKey, string sha256, long fileSize)> UploadAsync(
+        Stream fileStream, string contentType, Guid batchId)
+    {
+        var now = DateTimeOffset.UtcNow;
+        using var sha256 = SHA256.Create();
+        using var memStream = new MemoryStream();
+
+        await fileStream.CopyToAsync(memStream);
+        memStream.Position = 0;
+
+        var hashBytes = sha256.ComputeHash(memStream);
+        var hashHex = Convert.ToHexString(hashBytes).ToLowerInvariant();
+        memStream.Position = 0;
+
+        var extension = contentType switch
+        {
+            "application/pdf" => "pdf",
+            "image/jpeg" => "jpg",
+            "image/png" => "png",
+            _ => "bin"
+        };
+
+        var objectKey = $"scans/{now.Year}/{now.Month:D2}/{batchId}/{hashHex}.{extension}";
+
+        await EnsureBucketAsync();
+
+        await _minio.PutObjectAsync(new PutObjectArgs()
+            .WithBucket(_options.BucketName)
+            .WithObject(objectKey)
+            .WithStreamData(memStream)
+            .WithObjectSize(memStream.Length)
+            .WithContentType(contentType));
+
+        return (objectKey, hashHex, memStream.Length);
+    }
+
+    public async Task<string> GetPresignedUrlAsync(string objectKey)
+    {
+        return await _minio.PresignedGetObjectAsync(new PresignedGetObjectArgs()
+            .WithBucket(_options.BucketName)
+            .WithObject(objectKey)
+            .WithExpiry(_options.PresignedUrlExpiryMinutes * 60));
+    }
+
+    private async Task EnsureBucketAsync()
+    {
+        var exists = await _minio.BucketExistsAsync(new BucketExistsArgs().WithBucket(_options.BucketName));
+        if (!exists)
+            await _minio.MakeBucketAsync(new MakeBucketArgs().WithBucket(_options.BucketName));
+    }
+}
@@ -0,0 +1,5 @@
+public interface IAuthService
+{
+    Task<LoginResponse> LoginAsync(LoginRequest req);
+    Task<User> GetCurrentUserAsync(Guid userId);
+}
@@ -0,0 +1,8 @@
+public interface IBatchService
+{
+    Task<DigitizationBatch> CreateAsync(Stream fileStream, string contentType, BatchType batchType, BatchTrack track, Guid? patientId, Guid actorUserId);
+    Task<DigitizationBatch> GetByIdAsync(Guid id);
+    Task<PagedResult<DigitizationBatch>> ListAsync(BatchStatus? status, BatchType? batchType, Guid? assignedTo, BatchTrack? track, int page, int pageSize);
+    Task<DigitizationBatch> AssignAsync(Guid batchId, Guid entryClerkUserId, Guid actorUserId);
+    BatchStatus[] GetAllowedTransitions(BatchStatus current);
+}
@@ -0,0 +1,5 @@
+public interface IDocumentStorageService
+{
+    Task<(string objectKey, string sha256, long fileSize)> UploadAsync(Stream fileStream, string contentType, Guid batchId);
+    Task<string> GetPresignedUrlAsync(string objectKey);
+}
@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BCrypt.Net-Next" Version="4.0.3" />
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.4" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.27" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.4">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Minio" Version="6.0.3" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.4" />
+    <PackageReference Include="Serilog.AspNetCore" Version="8.0.2" />
+    <PackageReference Include="Serilog.Sinks.Console" Version="5.0.1" />
+    <PackageReference Include="Serilog.Sinks.Seq" Version="9.1.0" />
+    <PackageReference Include="StackExchange.Redis" Version="3.0.0" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
+  </ItemGroup>
+
+</Project>
@@ -0,0 +1,6 @@
+@VigilCareRecordsAPI_HostAddress = http://localhost:5217
+
+GET {{VigilCareRecordsAPI_HostAddress}}/weatherforecast/
+Accept: application/json
+
+###
@@ -0,0 +1,52 @@
+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Host=localhost;Port=5437;Database=vigilcare_records;Username=postgres;Password=password"
+  },
+  "Redis": {
+    "ConnectionString": "localhost:6383"
+  },
+  "Seq": {
+    "ServerUrl": "http://localhost:5346"
+  },
+  "Minio": {
+    "Endpoint": "localhost:9012",
+    "AccessKey": "minioadmin",
+    "SecretKey": "minioadmin",
+    "BucketName": "scans",
+    "UseSsl": false,
+    "PresignedUrlExpiryMinutes": 15
+  },
+  "Jwt": {
+    "Secret": "VigilCareRecordsDevSecretKeyAtLeast32Chars!",
+    "Issuer": "VigilCareRecords",
+    "Audience": "VigilCareRecords",
+    "ExpiryMinutes": 480
+  },
+  "Serilog": {
+    "Using": [ "Serilog.Sinks.Console", "Serilog.Sinks.Seq" ],
+    "MinimumLevel": {
+      "Default": "Information",
+      "Override": {
+        "Microsoft.AspNetCore": "Warning",
+        "Microsoft.EntityFrameworkCore.Database.Command": "Information"
+      }
+    },
+    "WriteTo": [
+      { "Name": "Console" },
+      {
+        "Name": "Seq",
+        "Args": {
+          "serverUrl": "http://localhost:5346"
+        }
+      }
+    ],
+    "Enrich": [ "FromLogContext" ]
+  },
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore.Database.Command": "Information"
+    }
+  }
+}
@@ -0,0 +1,54 @@
+services:
+  postgres:
+    image: postgres:16
+    environment:
+      POSTGRES_DB: vigilcare_records
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: password
+    ports:
+      - "5437:5432"
+    volumes:
+      - pg_data:/var/lib/postgresql/data
+    networks:
+      - vigilcare
+
+  redis:
+    image: redis:7-alpine
+    ports:
+      - "6383:6379"
+    networks:
+      - vigilcare
+
+  seq:
+    image: datalust/seq:latest
+    environment:
+      ACCEPT_EULA: "Y"
+    ports:
+      - "5346:80"
+    volumes:
+      - seq_data:/data
+    networks:
+      - vigilcare
+
+  minio:
+    image: minio/minio:latest
+    command: server /data --console-address ":9001"
+    environment:
+      MINIO_ROOT_USER: minioadmin
+      MINIO_ROOT_PASSWORD: minioadmin
+    ports:
+      - "9012:9000"
+      - "9013:9001"
+    volumes:
+      - minio_data:/data
+    networks:
+      - vigilcare
+
+volumes:
+  pg_data:
+  seq_data:
+  minio_data:
+
+networks:
+  vigilcare:
+    driver: bridge
@@ -0,0 +1,680 @@
+# PRD: VigilCare Records — Paper Chart Digitization & Approval Platform
+
+## Overview
+
+A clinical records intake system that converts paper-based patient charts into structured, human-verified digital records before they enter the VigilCareClinical alerting pipeline. Designed for small hospitals, district clinics, and island health systems where the majority of historical and day-to-day records still exist on paper.
+
+The workflow is deliberately manual at every extraction step:
+
+**Scan / upload → Human data entry → Human verification → Approved patient record**
+
+There is **no OCR** in scope. Every structured field is typed by a human who reads the scan. A second human compares the entry against the original image before the record becomes clinically authoritative. Unapproved drafts never trigger alerts, scoring, or surveillance.
+
+VigilCareClinical ([vigilcare-clinical-api-prd.md](vigilcare-clinical-api-prd.md)) remains the downstream intelligence layer: threshold alerting, NEWS2, sepsis detection, ward dashboard, and long-term archival. VigilCare Records is the **precursor** that creates the fuel — patient identity, encounters, and observations — in a governed, auditable way.
+
+This project maps to `sd-mid-009` (Outbox Pattern for approval promotion events), `sd-mid-013` (CQRS — draft vs live read models), `sd-junior-004` (RBAC), and senior trade-off conversations around **data quality gates vs time-to-value** in resource-constrained health systems.
+
+**Stack:** .NET 8 Web API, PostgreSQL, MinIO (scanned document storage), Redis (work-queue assignment locks), Serilog → Seq, Prometheus → Grafana, xUnit, Docker Compose. Vue 3 digitization workstation UI (separate repo or `VigilCare.Records.Web` project).
+
+**Prerequisite / companion:** VigilCareClinicalAPI Phases 1–2 minimum (patient, encounter, observation ingest). Full VigilCare value unlocks as approved observations flow into the existing Kafka alert pipeline.
+
+---
+
+## Goals
+
+- Provide a complete scan-to-approved workflow for paper chart conversion without OCR or machine extraction
+- Enforce **separation of duties**: the person who enters data cannot verify their own entry
+- Promote approved structured data into VigilCareClinical's live domain model (Patient, Encounter, Observation) atomically
+- Maintain a full audit trail linking every approved field to its source scan, entry clerk, verifier, and approver
+- Support two operational modes: **Track A** (historical backfill with full dual-human gate) and **Track B** (live bedside capture with clinician attestation, lighter gate)
+- Produce a deployable precursor that makes VigilCareClinical credible in paper-only facilities — not as a standalone EMR replacement
+
+## Non-Goals
+
+- **OCR or automated field extraction** — explicitly out of scope for v1; may be evaluated in a future phase after human-verified baseline quality is established
+- HL7/FHIR compliance or LIS instrument integration
+- Full EMR functionality (billing, pharmacy inventory, scheduling beyond basic encounter open)
+- Replacing VigilCareClinical's alert engine, scoring, or ward dashboard
+- HIPAA-certified or jurisdiction-specific medical device registration (model the patterns; certification scoped per deployment)
+- Multi-facility federated identity across islands (single-tenant deployment per site in v1)
+
+---
+
+## Problem Statement
+
+VigilCareClinical assumes structured, timestamped clinical data already exists. In paper-based facilities:
+
+1. Patient identity lives in folders, ward books, or duplicate index cards — no stable MRN workflow
+2. Vitals and lab results are handwritten — illegible, untimestamped at minute precision, or lost between visits
+3. There is no encounter boundary — "the patient" is not the same as "this admission" or "this clinic visit"
+4. Clinicians cannot trust machine-generated alerts if the underlying values were guessed from poor handwriting
+
+Without a digitization and approval layer, VigilCare has nothing to observe. With it, even a 20-bed district hospital can convert charts incrementally and activate real-time alerting as live capture replaces paper forms.
+
+---
+
+## Relationship to VigilCareClinical
+
+```
+┌─────────────────────────────────────────────────────────────────────┐
+│  VigilCare Records (this PRD)                                     │
+│                                                                     │
+│  Scan → Entry → Verify → Approve                                    │
+│       ↓                                                             │
+│  Draft tables (never alert)                                         │
+│       ↓ on approval                                                 │
+│  Promotion service ──────────────────────────────────────────────┐  │
+└──────────────────────────────────────────────────────────────────│──┘
+                                                                   │
+┌──────────────────────────────────────────────────────────────────▼──┐
+│  VigilCareClinicalAPI                                             │
+│                                                                     │
+│  Patient → Encounter → Observation → Outbox → Kafka → Alerts      │
+└─────────────────────────────────────────────────────────────────────┘
+```
+
+**Invariant:** Draft observations are invisible to VigilCareClinical's alert engine, Elasticsearch ward projection, and scoring consumers. Only batches that have passed approval are promoted to live tables. Promotion is idempotent — re-running an approval job for the same batch produces no duplicate live rows.
+
+**Track A (backfill):** Full pipeline — scan, entry, verification, approval. Historical vitals and labs enter as observations with `recordedAt` taken from the chart (not scan time). Alerts on backfilled critical values are **suppressed by default** unless the facility explicitly opts in per batch (`enableRetroactiveAlerts: false` default).
+
+**Track B (live capture):** Credentialed clinician enters vitals at bedside. Skips verification queue; requires `clinicianAttestation: true` on submit. Observations promote immediately to VigilCareClinical with `source: live_capture`. Every live-capture submission still creates a `DigitizationBatch` (audit unit) with draft observations, `DigitizationEvent` entries, and live rows in a single transaction — see [Track B audit model](#track-b-audit-model).
+
+**Deployment model (v1):** Integrated PostgreSQL — Records draft tables and VigilCareClinical live tables (`patients`, `encounters`, `observations`, `outbox_events`) share one database instance (separate schemas). Promotion runs in a single local transaction. Split deployment with HTTP + saga retry is documented as a future deployment option, not the portfolio default.
+
+---
+
+## API Conventions
+
+Same response envelope as VigilCareClinical and other portfolio projects. Prefix: `/api/v1`.
+
+**Success:**
+```json
+{
+  "success": true,
+  "statusCode": 200,
+  "data": {},
+  "error": null
+}
+```
+
+**Error:**
+```json
+{
+  "success": false,
+  "statusCode": 422,
+  "data": null,
+  "error": {
+    "message": "Verifier cannot approve a batch they entered.",
+    "code": "SEPARATION_OF_DUTIES_VIOLATION"
+  }
+}
+```
+
+**Pagination:** Work queues and batch lists use offset pagination (`?page=1&pageSize=20`). Audit event history uses cursor pagination on `(occurred_at DESC, id DESC)`.
+
+**Idempotency:** `POST /api/v1/digitization-batches/:id/approve` accepts an `Idempotency-Key` header. Duplicate approval requests return the same promotion result without creating duplicate live observations in VigilCareClinical.
+
+---
+
+## Roles and Permissions
+
+| Role | Permissions |
+|---|---|
+| **Intake clerk** | Upload scans, create batches, assign patient (existing MRN or new registration draft) |
+| **Data entry clerk** | Edit draft fields on batches in `uploaded` or `rejected` state; submit for verification |
+| **Verifier** | Review batches in `pending_verification`; field-level pass/fail; reject with reason; cannot verify batches they entered |
+| **Clinical approver** | Final promotion trigger via `POST .../approve` for batches in `verified` or `awaiting_clinical_approval`; cannot approve batches they entered |
+| **Clinician** | Track B live capture; attestation on own entries (attestation satisfies verify + approve for that batch only) |
+| **Administrator** | User management, batch type config, retroactive alert policy, work-queue reassignment |
+
+### Verification vs approval (Track A)
+
+Track A uses **two distinct human gates** before promotion:
+
+1. **Verifier** — compares structured draft fields against the scan (`POST .../verify` or `POST .../reject`). This is the dual-human data-quality check.
+2. **Clinical approver** — authorizes promotion (`POST .../approve`), which creates live clinical records. Every Track A batch requires this step regardless of batch type.
+
+**Optional third gate:** For high-stakes `batchType` values, site configuration routes verify-pass batches to `awaiting_clinical_approval` instead of `verified`. The clinical approver then reviews after the verifier before promotion. See [Site configuration](#site-configuration) below.
+
+| After verifier pass | Next status | Who calls `approve` |
+|---|---|---|
+| Site config: clinical sign-off **not** required for this `batchType` | `verified` | Clinical approver (or administrator) |
+| Site config: clinical sign-off **required** for this `batchType` | `awaiting_clinical_approval` | Clinical approver (or administrator) |
+
+Separation of duties is enforced at the service layer, not only in the UI. `enteredByUserId === currentUserId` blocks verify and approve actions with `409 SEPARATION_OF_DUTIES_VIOLATION`. Verifiers never call `approve`; clinical approvers never call `verify`.
+
+### Site configuration
+
+Per-site `ClinicalApprovalRequired` maps `batchType` to whether verify-pass routes to `awaiting_clinical_approval` (physician queue) vs `verified` (ready for immediate approver sign-off). Default portfolio configuration:
+
+| batchType | Clinical sign-off after verify? |
+|---|---|
+| `patient_registration` | No |
+| `allergy_update` | No |
+| `encounter_summary` | Yes |
+| `vitals_sheet` | Yes |
+| `lab_results` | Yes |
+| `medication_list` | Yes |
+| `mixed` | Yes |
+
+Administrators may override this map per deployment in `appsettings.json` (`SiteConfig.ClinicalApprovalRequired`).
+
+---
+
+## Domain Model
+
+### DigitizationBatch
+
+The unit of work for one digitization effort — typically one scanned document or one logical chart section (vitals sheet, lab report, admission face sheet).
+
+| Field | Description |
+|---|---|
+| `id` | UUID |
+| `status` | See state machine below |
+| `batchType` | `patient_registration`, `encounter_summary`, `vitals_sheet`, `lab_results`, `medication_list`, `allergy_update`, `mixed` |
+| `patientId` | Nullable until linked; may reference draft or live patient |
+| `encounterDraftId` | Nullable; encounter context for vitals/labs |
+| `documentRef` | MinIO object key for the scanned PDF/image |
+| `documentSha256` | Content hash for integrity verification |
+| `track` | `backfill` (Track A) or `live_capture` (Track B) |
+| `enableRetroactiveAlerts` | Default `false`; if `true` on approval, promoted observations participate in alerting |
+| `enteredByUserId` | Set on first draft save |
+| `verifiedByUserId` | Set on verification pass |
+| `approvedByUserId` | Set on final approval |
+| `rejectionReason` | Nullable; required when status → `rejected` |
+| `promotedAt` | Nullable; timestamp when live records created |
+| `promotionEncounterId` | VigilCareClinical encounter ID after promotion |
+| `supersedesBatchId` | Nullable; links a correction batch to the batch it replaces |
+| `clinicianAttestation` | `true` for Track B batches attested at bedside |
+
+### DraftPatient / DraftPatientUpdate
+
+Structured patient fields extracted from paper — demographics, allergies, blood type, emergency contact, medications (for `medication_list` batches). On approval of a `patient_registration` or `allergy_update` batch, merges into VigilCareClinical `Patient` (create or patch). `medicationsJson` is stored on the digitization audit record in v1; medication rows are not promoted to a pharmacy module (out of scope).
+
+### DraftEncounter
+
+A clinical episode extracted from the chart: admission date, department, room/bed, admission reason, discharge diagnosis (if applicable). Promotes to VigilCareClinical `Encounter`.
+
+### DraftObservation
+
+A single measurable value: observation code, numeric value, unit, `recordedAt` (from chart, required), optional note. Subject to the same plausibility ranges as VigilCareClinical ingest. Never written to live `observations` until batch approval.
+
+### DigitizationEvent
+
+Append-only audit log entry for every state transition and field-level correction.
+
+```json
+{
+  "id": "uuid",
+  "batchId": "uuid",
+  "eventType": "uploaded | entry_started | submitted_for_verification | rejected | verified | awaiting_clinical_approval | approved | promoted | live_capture_attested | correction_requested",
+  "actorUserId": "uuid",
+  "occurredAt": "2026-06-22T14:30:00Z",
+  "metadata": {
+    "rejectionReason": "SpO2 value unclear on scan — decimal ambiguous",
+    "fieldsChanged": ["observations[2].value"]
+  }
+}
+```
+
+### ScannedDocument
+
+Stored in MinIO. Original paper is the legal source; the scan is the working reference for entry and verification. Retention: minimum 7 years (configurable per jurisdiction). Scanned documents are **never deleted** when a batch is rejected — only the draft is returned for correction.
+
+---
+
+## Batch Status State Machine
+
+```
+                    ┌──────────────┐
+                    │   uploaded   │
+                    └──────┬───────┘
+                           │ assign / first save
+                           ▼
+                    ┌──────────────┐
+         ┌──────────│  in_entry    │◄─────────┐
+         │          └──────┬───────┘          │
+         │                 │ submit           │ reject
+         │                 ▼                  │
+         │          ┌──────────────┐         │
+         │          │   pending    │─────────┘
+         │          │ verification │
+         │          └──────┬───────┘
+         │                 │
+         │    verify fail  │ verify pass
+         │        ─────────┤
+         │                 │
+         │   site config   │ site config
+         │   = false       │ = true
+         │        ┌────────┴────────┐
+         │        ▼                 ▼
+         │  ┌──────────────┐  ┌──────────────────────┐
+         │  │   verified   │  │ awaiting_clinical    │
+         │  └──────┬───────┘  │     _approval          │
+         │         │          └──────────┬─────────────┘
+         │         └──────────┬──────────┘
+         │                    │ clinical approver: approve
+         │                    ▼
+         │             ┌──────────────┐
+         └────────────►│   approved   │
+                       └──────┬───────┘
+                              │ promotion (sync or retry job)
+                              ▼
+                       ┌──────────────┐
+                       │  promoted    │  (terminal — live records exist)
+                       └──────────────┘
+
+Track B shortcut: live_capture creates a batch already in promoted — see Track B audit model.
+```
+
+**Allowed transitions (Track A):**
+
+| From | To |
+|---|---|
+| `uploaded` | `in_entry` |
+| `in_entry` | `pending_verification` |
+| `pending_verification` | `verified`, `awaiting_clinical_approval`, `rejected` |
+| `rejected` | `in_entry` |
+| `verified` | `approved` |
+| `awaiting_clinical_approval` | `approved`, `rejected` |
+| `approved` | `promoted` |
+| `promoted` | *(none — terminal)* |
+
+Illegal transitions return `409` with a stable error code. A `promoted` batch cannot return to any earlier state. Corrections require a **new** batch referencing `supersedesBatchId`.
+
+### Track B audit model
+
+Track B is **not** a bypass of the batch model — it is a shortcut through the **workflow states**, not the audit unit. Every live-capture submission:
+
+1. Creates a `DigitizationBatch` with `track: live_capture`, `batchType: vitals_sheet` (or appropriate type), `documentRef: "live-capture"`, and a synthetic `documentSha256` derived from clinician + encounter + timestamp (no scan file).
+2. Writes `DraftObservation` rows for every entered value (audit trail).
+3. Sets `enteredByUserId`, `verifiedByUserId`, and `approvedByUserId` to the attesting clinician (attestation replaces the dual-human gate for that batch only).
+4. Inserts live `Observation` rows and outbox events in the **same transaction**, leaving the batch in `promoted` immediately.
+5. Emits `DigitizationEvent` entries: `live_capture_attested`, then `promoted`.
+
+This keeps digitization history, patient coverage stats, and Prometheus batch metrics consistent across both tracks.
+
+---
+
+## Features
+
+---
+
+### 1. Document Upload and Batch Creation
+
+**Description:** Intake clerk scans or uploads a paper record. System stores the file in MinIO, computes SHA-256, creates a batch in `uploaded` state, and writes a `DigitizationEvent`.
+
+**Endpoints:**
+- `POST /api/v1/digitization-batches` — multipart upload: `file` (PDF, JPEG, PNG; max 25 MB), `batchType`, optional `patientId`, optional `track` (default `backfill`)
+- `GET /api/v1/digitization-batches/:id` — batch detail with document presigned URL (15-minute expiry)
+- `GET /api/v1/digitization-batches` — filter by `status`, `batchType`, `assignedTo`, `track`; paginated
+- `PATCH /api/v1/digitization-batches/:id/assign` — assign to entry clerk (Redis lock prevents double-assignment)
+
+**Validation:**
+- Accepted MIME types: `application/pdf`, `image/jpeg`, `image/png`
+- Reject empty files
+- **Duplicate detection (when `patientId` is set):** reject if `documentSha256` matches an existing batch for the **same patient** within 24 hours (`409 DUPLICATE_DOCUMENT`) — prevents accidental double-scan of the same chart page
+- **Cross-patient duplicates:** the same physical form scanned for two different patients is allowed (distinct patients, distinct batches). Operators may still see a warning in the UI if the SHA matches any batch site-wide (informational only in v1)
+
+**Concepts practiced:** Object storage for immutable document artifacts, content-addressed deduplication, presigned URLs for secure document viewing without proxying binary through the API.
+
+---
+
+### 2. Draft Data Entry
+
+**Description:** Entry clerk views the scan alongside structured form fields. Saves draft patient updates, encounter context, and observations. Batch moves to `in_entry` on first save.
+
+**Endpoints:**
+- `GET /api/v1/digitization-batches/:id/draft` — full draft payload: patient fields, encounter, observations[]
+- `PUT /api/v1/digitization-batches/:id/draft/patient` — upsert draft patient demographics or updates
+- `PUT /api/v1/digitization-batches/:id/draft/encounter` — upsert draft encounter fields
+- `POST /api/v1/digitization-batches/:id/draft/observations` — add observation row
+- `PUT /api/v1/digitization-batches/:id/draft/observations/:obsId` — edit observation
+- `DELETE /api/v1/digitization-batches/:id/draft/observations/:obsId` — remove observation from draft
+- `POST /api/v1/digitization-batches/:id/submit-for-verification` — validates completeness, transitions to `pending_verification`
+
+**Required fields before submit (by batch type):**
+
+| batchType | Required draft content |
+|---|---|
+| `patient_registration` | Full name, date of birth, sex; MRN generated on approval if new |
+| `encounter_summary` | Linked patient; encounter with admission date, department, admission reason |
+| `vitals_sheet` | Linked patient, encounter context, ≥1 observation with `recordedAt` |
+| `lab_results` | Linked patient, encounter, ≥1 lab observation code, `recordedAt` |
+| `medication_list` | Linked patient; `medicationsJson` with ≥1 entry **or** explicit `noActiveMedications: true` |
+| `allergy_update` | Linked patient, allergies list (may be empty with explicit `noKnownAllergies: true`) |
+| `mixed` | Linked patient, encounter context, and **at least one** of: ≥1 observation with `recordedAt`, or complete encounter summary (admission date + department + admission reason) |
+
+**Concurrent draft editing:** Redis assignment lock prevents double-assignment at intake (`PATCH .../assign`). Draft saves require the acting user to match `enteredByUserId` (or hold the `Administrator` role); otherwise `409 BATCH_NOT_ASSIGNED`. v1 does not use field-level optimistic locking — within an assigned session, last write wins. Administrators may reassign via work-queue tools, which clears the Redis lock and updates `enteredByUserId`.
+
+**Plausibility validation:** Reuse VigilCareClinical observation plausibility ranges at draft save time. Out-of-range values return `422 OBSERVATION_OUT_OF_PLAUSIBLE_RANGE` with the same error shape — catch decimal errors (5.2 vs 52) before verification.
+
+**UI requirement (digitization workstation):** Side-by-side layout — scan viewer (zoom, pan, rotate) on the left; structured entry form on the right. Field-level "verified" checkbox for verifier pass (stored in draft metadata, not live record).
+
+**Concepts practiced:** Draft vs live data separation, optimistic UI with server validation, batch-type-driven validation rules.
+
+---
+
+### 3. Verification and Rejection
+
+**Description:** Verifier reviews entry against the scan. Can approve field-by-field or reject the entire batch with a mandatory reason. Verifier cannot be the entry clerk.
+
+On verify pass: status → `verified` or `awaiting_clinical_approval` per [site configuration](#site-configuration). On verify fail: status → `rejected` (returns to entry queue).
+
+**Endpoints:**
+- `GET /api/v1/work-queue/verification` — batches in `pending_verification`, sorted by `submittedAt ASC`
+- `GET /api/v1/work-queue/clinical-approval` — batches in `awaiting_clinical_approval`, sorted by `submittedAt ASC`
+- `POST /api/v1/digitization-batches/:id/verify` — body: `{ "fieldChecks": [{ "fieldPath": "observations[0].value", "passed": true }], "passed": true }`
+- `POST /api/v1/digitization-batches/:id/reject` — body: `{ "reason": "..." }` → status `rejected`, notifies entry clerk
+
+Reject is allowed from `pending_verification` (verifier; separation of duties applies) or `awaiting_clinical_approval` (clinical approver; separation of duties does **not** apply — approver may not have been the entry clerk by role design).
+
+**Concepts practiced:** Separation of duties enforcement, work-queue patterns, structured rejection loops.
+
+---
+
+### 4. Approval and Promotion to VigilCareClinical
+
+**Description:** Final approval triggers an atomic promotion: draft records become live Patient / Encounter / Observation rows in VigilCareClinical (same database in integrated deployment, or HTTP calls to VigilCareClinical API in split deployment). Batch status → `promoted`.
+
+**Endpoints:**
+- `POST /api/v1/digitization-batches/:id/approve` — requires `verified` or `awaiting_clinical_approval`; restricted to `ClinicalApprover` or `Administrator`; Idempotency-Key supported
+- `GET /api/v1/digitization-batches/:id/promotion-result` — live IDs created: `patientId`, `encounterId`, `observationIds[]`
+
+**Promotion transaction sequence:**
+1. Begin database transaction (or saga with compensating actions in split deployment)
+2. Create or update `Patient` in VigilCareClinical (assign MRN if new)
+3. Create or match `Encounter` (open as `active` or `discharged` based on draft)
+4. Insert each `DraftObservation` as live `Observation` with `source: digitization_backfill` or `source: live_capture`
+5. Write outbox events for each observation (Kafka pipeline activates **only if** `enableRetroactiveAlerts` or `track: live_capture`)
+6. Update batch status → `promoted`, set `promotedAt`, write `DigitizationEvent`
+7. Commit
+
+**Default alert behavior:**
+
+| track | enableRetroactiveAlerts | Alert pipeline |
+|---|---|---|
+| `backfill` | `false` (default) | Observations stored; no alert evaluation |
+| `backfill` | `true` | Full VigilCareClinical alert path |
+| `live_capture` | n/a | Full alert path immediately |
+
+**Concepts practiced:** Outbox pattern for promotion side effects, idempotent promotion, configurable clinical safety policy for historical data.
+
+---
+
+### 5. Corrections and Supersession
+
+**Description:** Approved records are not silently edited. A correction creates a new batch with `supersedesBatchId` pointing to the original. Correction goes through the full entry → verify → approve cycle. On promotion, erroneous live observations are marked `superseded` (append-only — not deleted).
+
+**Endpoints:**
+- `POST /api/v1/digitization-batches` — body includes optional `supersedesBatchId`
+- `GET /api/v1/patients/:id/digitization-history` — all batches for a patient with promotion status
+
+**Concepts practiced:** Immutable clinical audit trail, correction-as-new-batch pattern (same as national digital services land registry approach).
+
+---
+
+### 6. Live Capture (Track B)
+
+**Description:** Credentialed clinician enters vitals or labs at point of care on a tablet. No verification queue. Each submission creates an audit `DigitizationBatch` (see [Track B audit model](#track-b-audit-model)), writes draft observations for traceability, and promotes live observations synchronously with full alert evaluation.
+
+**Endpoints:**
+- `POST /api/v1/live-capture/encounters/:encounterId/observations` — body: observation fields + `clinicianAttestation: true` + password re-confirm or PIN
+- `POST /api/v1/live-capture/encounters` — open encounter + initial vitals in one request (outpatient workflow)
+
+**Validation:** Requires `Role: Clinician`. Creates batch + draft observations + live observations in one transaction; batch lands in `promoted` immediately. Returns VigilCareClinical observation IDs and any synchronous critical alerts generated.
+
+**Concepts practiced:** Lighter gate for real-time care vs heavy gate for backfill; same underlying observation schema.
+
+---
+
+### 7. Patient Registry (Draft and Live)
+
+**Description:** Search and link batches to patients. Support new patient registration through the draft pipeline.
+
+**Endpoints:**
+- `GET /api/v1/patients/search?q=` — search live VigilCareClinical patients by MRN or name
+- `POST /api/v1/patients/draft` — create draft-only patient (no MRN until approval)
+- `GET /api/v1/patients/:id/summary` — live patient + pending draft batches + digitization coverage stats
+
+**Digitization coverage stat:** `approvedBatchCount / estimatedTotalBatches` — optional manual `estimatedChartSections` per patient for progress tracking.
+
+---
+
+### 8. Work Queues and Operational Dashboard
+
+**Description:** Supervisors monitor backlog, assignment, and throughput.
+
+**Endpoints:**
+- `GET /api/v1/work-queue/entry` — batches awaiting or in entry
+- `GET /api/v1/work-queue/clinical-approval` — batches awaiting physician sign-off after verification
+- `GET /api/v1/work-queue/overview` — counts by status, average time-in-queue, reject rate
+- `GET /api/v1/digitization-batches/:id/events` — cursor-paginated audit trail
+
+**Metrics (Prometheus):**
+- `digitization_batches_by_status` (gauge)
+- `digitization_promotion_duration_seconds` (histogram)
+- `digitization_rejection_total` (counter)
+- `digitization_queue_age_seconds` (gauge — oldest pending verification)
+
+---
+
+### 9. Authentication and Audit
+
+**Description:** JWT auth with role claims. Every state transition writes a `DigitizationEvent`. Document access logged.
+
+**Endpoints:**
+- `POST /api/v1/auth/login`
+- `GET /api/v1/auth/me`
+
+**Audit requirements:**
+- Who viewed a scan and when
+- Who changed which draft field (field-level diff in event metadata on save)
+- Who approved promotion and which live record IDs were created
+
+---
+
+## Digitization Workstation UI
+
+Separate Vue 3 SPA or Razor-hosted frontend. Four primary views:
+
+| View | User | Purpose |
+|---|---|---|
+| **Intake** | Intake clerk | Upload, assign patient, print MRN label |
+| **Entry** | Data entry clerk | Side-by-side scan + form |
+| **Verification** | Verifier | Side-by-side with field checkboxes, approve/reject |
+| **Queue dashboard** | Supervisor | Backlog, reject rate, clerk throughput |
+
+Not a full EMR UI. No clinical alerting views — those remain in VigilCareClinical's ward dashboard.
+
+---
+
+## Data Storage
+
+| Store | Purpose |
+|---|---|
+| **PostgreSQL** | Draft tables, batch metadata, digitization events, user/role data. Shares database with VigilCareClinical in integrated deployment. |
+| **MinIO** | Scanned PDFs and images; content-addressed keys `scans/{year}/{month}/{batchId}/{sha256}.pdf` |
+| **Redis** | Batch assignment locks (`SET batch:assign:{id} NX EX 3600`). Work-queue counters are derived from PostgreSQL queries in v1 (no Redis counter cache required) |
+
+---
+
+## Integration Contract with VigilCareClinical
+
+**v1 deployment:** integrated PostgreSQL — promotion writes directly to VigilCareClinical tables in a single transaction. Split deployment (Records service calling VigilCareClinical REST + `PromotionRetryService`) remains supported as an alternate topology; see Phase 8.
+
+On promotion, VigilCare Records writes to the same tables VigilCareClinical owns:
+
+| Draft entity | Live entity | Notes |
+|---|---|---|
+| `DraftPatient` | `patients` | MRN generated via existing `GenerateMrnAsync` logic |
+| `DraftEncounter` | `encounters` | Status from draft; `roomBed`, `admissionReason` mapped |
+| `DraftObservation` | `observations` | Same `observationCode`, `value`, `unit`, `recordedAt`; adds `metadata.source` |
+
+Observation codes must match VigilCareClinical's catalog: `HEART_RATE`, `TEMP_C`, `BP_SYSTOLIC`, `BP_DIASTOLIC`, `RESP_RATE`, `SPO2`, `POTASSIUM_MEQ_L`, `GLUCOSE_MG_DL`, `WBC_K_UL`, `LACTATE_MMOL_L`, etc.
+
+If VigilCareClinical is unreachable in split deployment, batch remains `approved` and a background promotion retry job runs with exponential backoff. Batch does not revert to draft.
+
+---
+
+## Acceptance Criteria
+
+| Criterion | Verification |
+|---|---|
+| Separation of duties | Entry clerk cannot verify or approve own batch — `409` |
+| Draft isolation | Draft observations never appear in VigilCareClinical alert queries or ward dashboard |
+| Promotion atomicity | Partial promotion (patient created, observations failed) never committed |
+| Idempotent approval | Duplicate `Idempotency-Key` on approve returns same result, no duplicate observations |
+| Rejection loop | Rejected batch returns to entry; resubmit reaches verification again |
+| Backfill alert suppression | Default backfill promotion creates observations with zero alerts |
+| Live capture alert path | Track B critical potassium triggers synchronous alert in VigilCareClinical |
+| Audit completeness | Every status transition has a `DigitizationEvent` with actor and timestamp |
+| Document immutability | Scan object in MinIO not modified or deleted on reject/correct |
+| Plausibility at draft | Value 520 for potassium rejected at draft save, not at promotion |
+| Clinical approval routing | `vitals_sheet` verify-pass → `awaiting_clinical_approval` when site config requires it |
+| Track B audit batch | Live capture creates `DigitizationBatch` in `promoted` with draft observations and events |
+| Draft assignment guard | Unassigned clerk receives `409 BATCH_NOT_ASSIGNED` on draft save |
+| Cross-patient duplicate scan | Same SHA for two different patients allowed; same patient within 24h rejected |
+
+---
+
+## Build Order
+
+| Phase | Focus |
+|---|---|
+| 1 | Schema, auth, roles, batch CRUD, MinIO upload, status machine |
+| 2 | Draft entry API (patient, encounter, observations), submit-for-verification |
+| 3 | Verification, rejection, separation of duties, work queues |
+| 4 | Promotion service → VigilCareClinical live tables, outbox integration, idempotency |
+| 5 | Corrections / supersession, patient digitization history |
+| 6 | Track B live capture with clinician attestation |
+| 7 | Digitization workstation UI (entry + verification side-by-side) |
+| 8 | Prometheus metrics, supervisor dashboard, promotion retry job |
+| 9 | Seed data, E2E verification script, clinical scenario documentation |
+
+---
+
+## Step-by-Step Guide
+
+Complete phases in order. Promotion (Phase 4) must not be built until the draft state machine and separation of duties are correct — debugging promotion bugs alongside workflow bugs is painful.
+
+---
+
+### Phase 1 — Schema, Upload, and Status Machine
+
+**What to do:**
+1. Create `digitization_batches`, `draft_patients`, `draft_encounters`, `draft_observations`, `digitization_events` tables.
+2. Implement batch status machine with explicit transition matrix; illegal transitions → `409`.
+3. Wire MinIO upload with SHA-256 computation and presigned GET URLs.
+4. Seed two users per role (entry, verifier, clinician) for separation-of-duties testing.
+5. Implement JWT auth with role claims.
+
+**Why:**
+The status machine is the backbone. Getting transitions wrong means drafts leak into live data or approved batches get re-edited. Test every illegal transition before building entry forms.
+
+---
+
+### Phase 2 — Draft Entry
+
+**What to do:**
+1. Implement draft CRUD endpoints and batch-type validation on submit.
+2. Port plausibility validator from VigilCareClinical (shared library or duplicated with comment linking source).
+3. Write integration tests: incomplete vitals batch cannot submit; plausible observations save; implausible rejected.
+
+**Why:**
+Plausibility at draft save prevents the most common digitization error — decimal misplacement — from ever reaching verification.
+
+---
+
+### Phase 3 — Verification and Rejection
+
+**What to do:**
+1. Implement verification and rejection endpoints with separation-of-duties checks.
+2. Build work-queue endpoints sorted by `submittedAt`.
+3. Test: entry clerk A submits → verifier A attempts verify → `409`; verifier B succeeds.
+
+**Why:**
+Separation of duties is a clinical trust requirement, not a nice-to-have. Enforce in the service layer from day one.
+
+---
+
+### Phase 4 — Promotion
+
+**What to do:**
+1. Implement approval endpoint and promotion transaction against VigilCareClinical tables.
+2. Wire outbox events for observations where alerting is enabled.
+3. Implement `enableRetroactiveAlerts` flag — default `false`.
+4. Test full path: upload → entry → verify → approve → observations in live table → zero alerts for backfill default.
+5. Test idempotency: approve twice with same key → one set of live rows.
+
+**Why:**
+This phase connects Records to Clinical. Run against a VigilCareClinical Phase 2 environment where synchronous critical alerting exists, and verify Track B vs Track A behavior explicitly.
+
+---
+
+### Phase 5 — Corrections
+
+**What to do:**
+1. Add `supersedesBatchId` and supersession logic on promotion.
+2. Mark superseded live observations inactive (soft flag, not delete).
+3. Test: wrong potassium promoted → correction batch → new value live, old value superseded in audit.
+
+---
+
+### Phase 6 — Live Capture (Track B)
+
+**What to do:**
+1. Implement clinician attestation endpoint bypassing verification.
+2. Test critical value entered via live capture → alert fires before response returns.
+
+---
+
+### Phases 7–9 — UI, Observability, Documentation
+
+Build the side-by-side workstation UI. Add Prometheus metrics and a supervisor queue view. Write `docs/digitization-workstation-guide.md` and an E2E script `./scripts/run-vigilcare-records-verification.sh`.
+
+---
+
+## Deployment Notes (Small Island Context)
+
+- **Single-site tenant:** One hospital or health district per deployment. No cross-island federation in v1.
+- **Offline intake (optional extension):** Scan and draft entry on a local server; promotion queued until uplink to central VigilCareClinical returns. Aligns with VigilCareClinical climate-resilience Phases 20–24 — Records gateway can share the same ward-first sync pattern.
+- **Staffing reality:** Same person may hold entry and intake roles, but **never** entry and verifier on the same batch. System enforces this even when staff roster is small.
+- **Paper originals:** Scanned document is the working copy; physical chart remains legal original until jurisdiction defines otherwise. README must state this explicitly.
+
+---
+
+## Success Metrics (Operational)
+
+| Metric | Target (6 months post go-live) |
+|---|---|
+| Charts with ≥1 approved batch | 80% of active patients |
+| Average verification turnaround | < 24 hours |
+| Rejection rate | < 15% (indicates entry quality or scan quality issues if higher) |
+| Live capture share of new observations | Trending up month-over-month |
+| VigilCareClinical alerts from live capture | ≥1 demonstrated critical-value workflow per site |
+
+---
+
+## Architecture Decisions
+
+| Decision | Choice (v1) | Rationale |
+|---|---|---|
+| **Integrated DB vs split API** | Integrated PostgreSQL, shared instance, separate schemas | Atomic promotion in one transaction; simpler to build and demo; split path documented for production hardening |
+| **Clinical approver routing** | Site config map (see [Site configuration](#site-configuration)); default requires physician queue for encounter/vitals/labs/medications/mixed | High-stakes chart sections get an extra gate; registration and allergy-only updates stay verifier → approver |
+| **Retroactive alerts** | `enableRetroactiveAlerts: false` default on backfill | Prevents alert storms from historical critical values; opt-in per batch for facilities that accept the risk |
+| **MRN issuance** | Locally generated MRN via VigilCareClinical `GenerateMrnAsync` | National health ID integration deferred per deployment |
+
+## Open Questions (per deployment)
+
+1. **Retroactive alerts policy:** Will the Ministry of Health allow backfilled critical values to trigger pages, or is storage-only the mandated default?
+2. **MRN issuance:** National health ID integration vs locally generated MRN when a national registry becomes available?
+3. **Split deployment:** When does the site require Records and Clinical in separate services (saga + retry) vs integrated database?
+
+---
+
+## References
+
+- [vigilcare-clinical-api-prd.md](vigilcare-clinical-api-prd.md) — downstream alerting and observation ingest
+- [Completed/VigilCareClinicalAPI/VigilCare-Partner-Brief.md](Completed/VigilCareClinicalAPI/VigilCare-Partner-Brief.md) — clinical positioning and scope boundaries
+- [Completed/national-digital-services-architecture.md](Completed/national-digital-services-architecture.md) — scan-and-verify pattern for paper-to-digital government services
				`@@ -0,0 +1 @@`
				`public record LoginRequest(string Username, string Password);`
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				`public record LoginResponse(string Token, Guid UserId, string Username, string FullName, string Role);`
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				`public record AssignBatchRequest(Guid EntryClerkUserId);`