Changes

2026-05-04 21:41:14 +03:00
parent 30370e0e90
commit 20b4127fda
17 changed files with 502 additions and 463 deletions
@@ -0,0 +1,10 @@
+namespace Api.Data.Entities;
+
+public sealed class RagChatCompletionCacheEntity
+{
+    public string CacheKey { get; set; } = string.Empty;
+    public string Model { get; set; } = string.Empty;
+    public decimal Temperature { get; set; }
+    public string ResponseText { get; set; } = string.Empty;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}
@@ -0,0 +1,12 @@
+namespace Api.Data.Entities;
+
+public sealed class RagChunkEntity
+{
+    public string Id { get; set; } = string.Empty;
+    public string DocumentId { get; set; } = string.Empty;
+    public int ChunkIndex { get; set; }
+    public string Text { get; set; } = string.Empty;
+    public byte[] Embedding { get; set; } = [];
+
+    public RagDocumentEntity? Document { get; set; }
+}
@@ -0,0 +1,16 @@
+namespace Api.Data.Entities;
+
+public sealed class RagDocumentEntity
+{
+    public string Id { get; set; } = string.Empty;
+    public string DocumentType { get; set; } = string.Empty;
+    public string Title { get; set; } = string.Empty;
+    public string? SourceUrl { get; set; }
+    public string RawText { get; set; } = string.Empty;
+    public string TextHash { get; set; } = string.Empty;
+    public double TypeConfidence { get; set; }
+    public string MetadataJson { get; set; } = "{}";
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    public ICollection<RagChunkEntity> Chunks { get; set; } = [];
+}
@@ -0,0 +1,10 @@
+namespace Api.Data.Entities;
+
+public sealed class RagEmbeddingCacheEntity
+{
+    public string CacheKey { get; set; } = string.Empty;
+    public string Model { get; set; } = string.Empty;
+    public string TextHash { get; set; } = string.Empty;
+    public byte[] Vector { get; set; } = [];
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}
@@ -0,0 +1,72 @@
+using Api.Data.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace Api.Data;
+
+public sealed class RagDbContext : DbContext
+{
+    public RagDbContext(DbContextOptions<RagDbContext> options) : base(options)
+    {
+    }
+
+    public DbSet<RagDocumentEntity> RagDocuments => Set<RagDocumentEntity>();
+    public DbSet<RagChunkEntity> RagChunks => Set<RagChunkEntity>();
+    public DbSet<RagEmbeddingCacheEntity> RagEmbeddingCache => Set<RagEmbeddingCacheEntity>();
+    public DbSet<RagChatCompletionCacheEntity> RagChatCompletionCache => Set<RagChatCompletionCacheEntity>();
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<RagDocumentEntity>(entity =>
+        {
+            entity.ToTable("RagDocuments");
+            entity.HasKey(x => x.Id);
+            entity.Property(x => x.Id).HasMaxLength(64);
+            entity.Property(x => x.DocumentType).HasMaxLength(80).IsRequired();
+            entity.Property(x => x.Title).HasMaxLength(300).IsRequired();
+            entity.Property(x => x.SourceUrl).HasMaxLength(1200);
+            entity.Property(x => x.RawText).IsRequired();
+            entity.Property(x => x.TextHash).HasMaxLength(64).IsRequired();
+            entity.Property(x => x.MetadataJson).HasDefaultValue("{}").IsRequired();
+            entity.Property(x => x.CreatedAt).HasDefaultValueSql("SYSUTCDATETIME()");
+            entity.HasIndex(x => x.TextHash);
+            entity.HasIndex(x => x.DocumentType);
+        });
+
+        modelBuilder.Entity<RagChunkEntity>(entity =>
+        {
+            entity.ToTable("RagChunks");
+            entity.HasKey(x => x.Id);
+            entity.Property(x => x.Id).HasMaxLength(64);
+            entity.Property(x => x.DocumentId).HasMaxLength(64).IsRequired();
+            entity.Property(x => x.Text).IsRequired();
+            entity.Property(x => x.Embedding).IsRequired();
+            entity.HasOne(x => x.Document)
+                .WithMany(x => x.Chunks)
+                .HasForeignKey(x => x.DocumentId)
+                .OnDelete(DeleteBehavior.Cascade);
+        });
+
+        modelBuilder.Entity<RagEmbeddingCacheEntity>(entity =>
+        {
+            entity.ToTable("RagEmbeddingCache");
+            entity.HasKey(x => x.CacheKey);
+            entity.Property(x => x.CacheKey).HasMaxLength(64);
+            entity.Property(x => x.Model).HasMaxLength(120).IsRequired();
+            entity.Property(x => x.TextHash).HasMaxLength(64).IsRequired();
+            entity.Property(x => x.Vector).IsRequired();
+            entity.Property(x => x.CreatedAt).HasDefaultValueSql("SYSUTCDATETIME()");
+            entity.HasIndex(x => x.TextHash);
+        });
+
+        modelBuilder.Entity<RagChatCompletionCacheEntity>(entity =>
+        {
+            entity.ToTable("RagChatCompletionCache");
+            entity.HasKey(x => x.CacheKey);
+            entity.Property(x => x.CacheKey).HasMaxLength(64);
+            entity.Property(x => x.Model).HasMaxLength(120).IsRequired();
+            entity.Property(x => x.Temperature).HasColumnType("decimal(4,2)");
+            entity.Property(x => x.ResponseText).IsRequired();
+            entity.Property(x => x.CreatedAt).HasDefaultValueSql("SYSUTCDATETIME()");
+        });
+    }
+}
@@ -1,10 +1,12 @@
 using Azure.Identity;
 using Microsoft.AspNetCore.Diagnostics;
+using Api.Data;
 using Api.Services;
 using Api.Services.Contracts;
 using Api.Settings;
 using Serilog;
 using System.Reflection;
+using Microsoft.EntityFrameworkCore;

 DotNetEnv.Env.Load();

@@ -64,8 +66,12 @@ try
    builder.Services.Configure<AiSettings>(builder.Configuration.GetSection("Ai"));
    builder.Services.Configure<InternalApiSettings>(builder.Configuration.GetSection("InternalApi"));

+    builder.Services.AddDbContext<RagDbContext>(options =>
+        options.UseSqlServer(builder.Configuration.GetConnectionString("RagDb")
+            ?? throw new InvalidOperationException("Connection string 'RagDb' is missing.")));
+
    builder.Services.AddHttpClient<RawAiClient>();
-    builder.Services.AddSingleton<IRagRepository, SqlRagRepository>();
+    builder.Services.AddScoped<IRagRepository, EfRagRepository>();
    builder.Services.AddScoped<IAiClient, CachedAiClient>();
    builder.Services.AddSingleton<ITextExtractor, TextExtractor>();
    builder.Services.AddSingleton<ITextChunker, TextChunker>();
@@ -159,6 +165,13 @@ try
    app.MapControllers();
    app.MapGet("/health", () => Results.Ok(new { status = "ok", service = "rag-api", version = appVersion, timeUtc = DateTimeOffset.UtcNow }));

+    Log.Information("Running EfCore DbMigrations if any");
+    using (var scope = app.Services.CreateScope())
+    {
+        var db = scope.ServiceProvider.GetRequiredService<RagDbContext>();
+        db.Database.Migrate();
+    }
+
    Log.Information("{Service} startup complete", "rag-api");
    app.Run();
 }
@@ -0,0 +1,195 @@
+using Api.Data;
+using Api.Data.Entities;
+using Api.Services.Contracts;
+using Api.Services.Contracts.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace Api.Services;
+
+public sealed class EfRagRepository : IRagRepository
+{
+    private readonly RagDbContext _db;
+    private readonly ILogger<EfRagRepository> _logger;
+
+    public EfRagRepository(RagDbContext db, ILogger<EfRagRepository> logger)
+    {
+        _db = db;
+        _logger = logger;
+    }
+
+    public async Task InitializeAsync(CancellationToken ct)
+    {
+        _logger.LogInformation("Ensuring RAG database schema exists using EF Core");
+        await _db.Database.EnsureCreatedAsync(ct);
+    }
+
+    public async Task<RagDocumentRecord?> GetDocumentByTextHashAsync(string textHash, string? sourceUrl, CancellationToken ct)
+    {
+        var query = _db.RagDocuments
+            .AsNoTracking()
+            .Where(x => x.TextHash == textHash);
+
+        if (!string.IsNullOrWhiteSpace(sourceUrl))
+        {
+            query = query.Where(x => x.SourceUrl == sourceUrl);
+        }
+
+        var entity = await query
+            .OrderByDescending(x => x.CreatedAt)
+            .FirstOrDefaultAsync(ct);
+
+        return entity is null ? null : ToRecord(entity);
+    }
+
+    public async Task<RagDocumentRecord?> GetDocumentByIdAsync(string id, CancellationToken ct)
+    {
+        var entity = await _db.RagDocuments
+            .AsNoTracking()
+            .FirstOrDefaultAsync(x => x.Id == id, ct);
+
+        return entity is null ? null : ToRecord(entity);
+    }
+
+    public async Task SaveDocumentAsync(RagDocumentRecord document, IReadOnlyList<RagChunkRecord> chunks, CancellationToken ct)
+    {
+        var exists = await _db.RagDocuments.AnyAsync(x => x.Id == document.Id, ct);
+        if (exists)
+        {
+            _logger.LogInformation("RAG document already exists. DocumentId={DocumentId}", document.Id);
+            return;
+        }
+
+        var entity = new RagDocumentEntity
+        {
+            Id = document.Id,
+            DocumentType = document.DocumentType,
+            Title = document.Title,
+            SourceUrl = document.SourceUrl,
+            RawText = document.Text,
+            TextHash = document.TextHash,
+            TypeConfidence = document.TypeConfidence,
+            MetadataJson = document.MetadataJson,
+            CreatedAt = document.CreatedAt.UtcDateTime,
+            Chunks = chunks.Select(chunk => new RagChunkEntity
+            {
+                Id = chunk.Id,
+                DocumentId = chunk.DocumentId,
+                ChunkIndex = chunk.ChunkIndex,
+                Text = chunk.Text,
+                Embedding = VectorSerializer.ToBytes(chunk.Embedding)
+            }).ToList()
+        };
+
+        _db.RagDocuments.Add(entity);
+        await _db.SaveChangesAsync(ct);
+    }
+
+    public async Task<IReadOnlyList<SearchCandidateChunk>> SearchChunksAsync(
+        float[] queryEmbedding,
+        IReadOnlyList<string>? targetTypes,
+        int topK,
+        CancellationToken ct)
+    {
+        var types = targetTypes?
+            .Where(x => !string.IsNullOrWhiteSpace(x))
+            .Select(x => x.Trim().ToLowerInvariant())
+            .Distinct()
+            .ToArray() ?? [];
+
+        var query = _db.RagChunks
+            .AsNoTracking()
+            .Include(x => x.Document)
+            .AsQueryable();
+
+        if (types.Length > 0)
+        {
+            query = query.Where(x => x.Document != null && types.Contains(x.Document.DocumentType.ToLower()));
+        }
+
+        var rows = await query.ToListAsync(ct);
+
+        return rows
+            .Where(x => x.Document is not null)
+            .Select(x => new SearchCandidateChunk
+            {
+                Document = ToRecord(x.Document!),
+                Chunk = new RagChunkRecord
+                {
+                    Id = x.Id,
+                    DocumentId = x.DocumentId,
+                    ChunkIndex = x.ChunkIndex,
+                    Text = x.Text,
+                    Embedding = VectorSerializer.FromBytes(x.Embedding)
+                },
+                Score = VectorSerializer.CosineSimilarity(queryEmbedding, VectorSerializer.FromBytes(x.Embedding))
+            })
+            .OrderByDescending(x => x.Score)
+            .Take(Math.Max(topK * 4, topK))
+            .ToList();
+    }
+
+    public async Task<float[]?> GetEmbeddingAsync(string cacheKey, CancellationToken ct)
+    {
+        var entry = await _db.RagEmbeddingCache
+            .AsNoTracking()
+            .FirstOrDefaultAsync(x => x.CacheKey == cacheKey, ct);
+
+        return entry is null ? null : VectorSerializer.FromBytes(entry.Vector);
+    }
+
+    public async Task SaveEmbeddingAsync(string cacheKey, string model, string textHash, float[] vector, CancellationToken ct)
+    {
+        var exists = await _db.RagEmbeddingCache.AnyAsync(x => x.CacheKey == cacheKey, ct);
+        if (exists) return;
+
+        _db.RagEmbeddingCache.Add(new RagEmbeddingCacheEntity
+        {
+            CacheKey = cacheKey,
+            Model = model,
+            TextHash = textHash,
+            Vector = VectorSerializer.ToBytes(vector),
+            CreatedAt = DateTime.UtcNow
+        });
+
+        await _db.SaveChangesAsync(ct);
+    }
+
+    public async Task<string?> GetChatCompletionAsync(string cacheKey, CancellationToken ct)
+    {
+        return await _db.RagChatCompletionCache
+            .AsNoTracking()
+            .Where(x => x.CacheKey == cacheKey)
+            .Select(x => x.ResponseText)
+            .FirstOrDefaultAsync(ct);
+    }
+
+    public async Task SaveChatCompletionAsync(string cacheKey, string model, decimal temperature, string responseText, CancellationToken ct)
+    {
+        var exists = await _db.RagChatCompletionCache.AnyAsync(x => x.CacheKey == cacheKey, ct);
+        if (exists) return;
+
+        _db.RagChatCompletionCache.Add(new RagChatCompletionCacheEntity
+        {
+            CacheKey = cacheKey,
+            Model = model,
+            Temperature = temperature,
+            ResponseText = responseText,
+            CreatedAt = DateTime.UtcNow
+        });
+
+        await _db.SaveChangesAsync(ct);
+    }
+
+    private static RagDocumentRecord ToRecord(RagDocumentEntity entity) => new()
+    {
+        Id = entity.Id,
+        DocumentType = entity.DocumentType,
+        Title = entity.Title,
+        SourceUrl = entity.SourceUrl,
+        Text = entity.RawText,
+        TextHash = entity.TextHash,
+        TypeConfidence = entity.TypeConfidence,
+        MetadataJson = entity.MetadataJson,
+        CreatedAt = new DateTimeOffset(DateTime.SpecifyKind(entity.CreatedAt, DateTimeKind.Utc))
+    };
+}
@@ -1,238 +0,0 @@
-using Microsoft.Data.SqlClient;
-using Api.Services.Contracts;
-using Api.Services.Contracts.Models;
-
-namespace Api.Services;
-
-public sealed class SqlRagRepository : IRagRepository
-{
-    private readonly string _connectionString;
-
-    public SqlRagRepository(IConfiguration configuration)
-    {
-        _connectionString = configuration.GetConnectionString("RagDb")
-            ?? throw new InvalidOperationException("Connection string 'RagDb' is missing.");
-    }
-
-    public async Task InitializeAsync(CancellationToken ct)
-    {
-        await EnsureDatabaseExistsAsync(ct);
-        var sql = await File.ReadAllTextAsync(Path.Combine(AppContext.BaseDirectory, "Database", "schema.sql"), ct);
-        await using var connection = new SqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
-        foreach (var commandText in sql.Split("GO", StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
-        {
-            await using var command = new SqlCommand(commandText, connection);
-            await command.ExecuteNonQueryAsync(ct);
-        }
-    }
-
-    public async Task<RagDocumentRecord?> GetDocumentByTextHashAsync(string textHash, string? sourceUrl, CancellationToken ct)
-    {
-        const string sql = """
-            SELECT TOP 1 Id, DocumentType, Title, SourceUrl, RawText, TextHash, TypeConfidence, MetadataJson, CreatedAt
-            FROM RagDocuments
-            WHERE TextHash = @TextHash AND (@SourceUrl IS NULL OR SourceUrl = @SourceUrl)
-            ORDER BY CreatedAt DESC
-            """;
-        await using var connection = new SqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
-        await using var command = new SqlCommand(sql, connection);
-        command.Parameters.AddWithValue("@TextHash", textHash);
-        command.Parameters.AddWithValue("@SourceUrl", (object?)sourceUrl ?? DBNull.Value);
-        await using var reader = await command.ExecuteReaderAsync(ct);
-        return await reader.ReadAsync(ct) ? ReadDocument(reader) : null;
-    }
-
-    public async Task<RagDocumentRecord?> GetDocumentByIdAsync(string id, CancellationToken ct)
-    {
-        const string sql = """
-            SELECT Id, DocumentType, Title, SourceUrl, RawText, TextHash, TypeConfidence, MetadataJson, CreatedAt
-            FROM RagDocuments
-            WHERE Id = @Id
-            """;
-        await using var connection = new SqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
-        await using var command = new SqlCommand(sql, connection);
-        command.Parameters.AddWithValue("@Id", id);
-        await using var reader = await command.ExecuteReaderAsync(ct);
-        return await reader.ReadAsync(ct) ? ReadDocument(reader) : null;
-    }
-
-    public async Task SaveDocumentAsync(RagDocumentRecord document, IReadOnlyList<RagChunkRecord> chunks, CancellationToken ct)
-    {
-        await using var connection = new SqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
-        await using var tx = (SqlTransaction)await connection.BeginTransactionAsync(ct);
-        try
-        {
-            const string insertDoc = """
-                INSERT INTO RagDocuments (Id, DocumentType, Title, SourceUrl, RawText, TextHash, TypeConfidence, MetadataJson, CreatedAt)
-                VALUES (@Id, @DocumentType, @Title, @SourceUrl, @RawText, @TextHash, @TypeConfidence, @MetadataJson, @CreatedAt)
-                """;
-            await using (var command = new SqlCommand(insertDoc, connection, tx))
-            {
-                command.Parameters.AddWithValue("@Id", document.Id);
-                command.Parameters.AddWithValue("@DocumentType", document.DocumentType);
-                command.Parameters.AddWithValue("@Title", document.Title);
-                command.Parameters.AddWithValue("@SourceUrl", (object?)document.SourceUrl ?? DBNull.Value);
-                command.Parameters.AddWithValue("@RawText", document.Text);
-                command.Parameters.AddWithValue("@TextHash", document.TextHash);
-                command.Parameters.AddWithValue("@TypeConfidence", document.TypeConfidence);
-                command.Parameters.AddWithValue("@MetadataJson", document.MetadataJson);
-                command.Parameters.AddWithValue("@CreatedAt", document.CreatedAt.UtcDateTime);
-                await command.ExecuteNonQueryAsync(ct);
-            }
-
-            const string insertChunk = """
-                INSERT INTO RagChunks (Id, DocumentId, ChunkIndex, Text, Embedding)
-                VALUES (@Id, @DocumentId, @ChunkIndex, @Text, @Embedding)
-                """;
-            foreach (var chunk in chunks)
-            {
-                await using var command = new SqlCommand(insertChunk, connection, tx);
-                command.Parameters.AddWithValue("@Id", chunk.Id);
-                command.Parameters.AddWithValue("@DocumentId", document.Id);
-                command.Parameters.AddWithValue("@ChunkIndex", chunk.ChunkIndex);
-                command.Parameters.AddWithValue("@Text", chunk.Text);
-                command.Parameters.AddWithValue("@Embedding", VectorSerializer.ToBytes(chunk.Embedding));
-                await command.ExecuteNonQueryAsync(ct);
-            }
-            await tx.CommitAsync(ct);
-        }
-        catch
-        {
-            await tx.RollbackAsync(ct);
-            throw;
-        }
-    }
-
-    public async Task<IReadOnlyList<SearchCandidateChunk>> SearchChunksAsync(float[] queryEmbedding, IReadOnlyList<string>? targetTypes, int topK, CancellationToken ct)
-    {
-        var types = targetTypes?.Where(x => !string.IsNullOrWhiteSpace(x)).Select(x => x.Trim().ToLowerInvariant()).Distinct().ToArray() ?? [];
-        var sql = """
-            SELECT d.Id, d.DocumentType, d.Title, d.SourceUrl, d.RawText, d.TextHash, d.TypeConfidence, d.MetadataJson, d.CreatedAt,
-                   c.Id, c.DocumentId, c.ChunkIndex, c.Text, c.Embedding
-            FROM RagChunks c
-            INNER JOIN RagDocuments d ON d.Id = c.DocumentId
-            """;
-
-        if (types.Length > 0)
-        {
-            sql += " WHERE LOWER(d.DocumentType) IN (" + string.Join(',', types.Select((_, i) => $"@Type{i}")) + ")";
-        }
-
-        await using var connection = new SqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
-        await using var command = new SqlCommand(sql, connection);
-        for (var i = 0; i < types.Length; i++) command.Parameters.AddWithValue($"@Type{i}", types[i]);
-        await using var reader = await command.ExecuteReaderAsync(ct);
-        var candidates = new List<SearchCandidateChunk>();
-        while (await reader.ReadAsync(ct))
-        {
-            var doc = ReadDocument(reader, 0);
-            var chunk = new RagChunkRecord
-            {
-                Id = reader.GetString(9),
-                DocumentId = reader.GetString(10),
-                ChunkIndex = reader.GetInt32(11),
-                Text = reader.GetString(12),
-                Embedding = VectorSerializer.FromBytes((byte[])reader[13])
-            };
-            candidates.Add(new SearchCandidateChunk
-            {
-                Document = doc,
-                Chunk = chunk,
-                Score = VectorSerializer.CosineSimilarity(queryEmbedding, chunk.Embedding)
-            });
-        }
-
-        return candidates
-            .OrderByDescending(x => x.Score)
-            .Take(Math.Max(topK * 4, topK))
-            .ToList();
-    }
-
-    public async Task<float[]?> GetEmbeddingAsync(string cacheKey, CancellationToken ct)
-    {
-        const string sql = "SELECT Vector FROM RagEmbeddingCache WHERE CacheKey = @CacheKey";
-        await using var connection = new SqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
-        await using var command = new SqlCommand(sql, connection);
-        command.Parameters.AddWithValue("@CacheKey", cacheKey);
-        var value = await command.ExecuteScalarAsync(ct);
-        return value is byte[] bytes ? VectorSerializer.FromBytes(bytes) : null;
-    }
-
-    public async Task SaveEmbeddingAsync(string cacheKey, string model, string textHash, float[] vector, CancellationToken ct)
-    {
-        const string sql = """
-            IF NOT EXISTS (SELECT 1 FROM RagEmbeddingCache WHERE CacheKey = @CacheKey)
-            INSERT INTO RagEmbeddingCache (CacheKey, Model, TextHash, Vector, CreatedAt)
-            VALUES (@CacheKey, @Model, @TextHash, @Vector, SYSUTCDATETIME())
-            """;
-        await using var connection = new SqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
-        await using var command = new SqlCommand(sql, connection);
-        command.Parameters.AddWithValue("@CacheKey", cacheKey);
-        command.Parameters.AddWithValue("@Model", model);
-        command.Parameters.AddWithValue("@TextHash", textHash);
-        command.Parameters.AddWithValue("@Vector", VectorSerializer.ToBytes(vector));
-        await command.ExecuteNonQueryAsync(ct);
-    }
-
-    public async Task<string?> GetChatCompletionAsync(string cacheKey, CancellationToken ct)
-    {
-        const string sql = "SELECT ResponseText FROM RagChatCompletionCache WHERE CacheKey = @CacheKey";
-        await using var connection = new SqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
-        await using var command = new SqlCommand(sql, connection);
-        command.Parameters.AddWithValue("@CacheKey", cacheKey);
-        return await command.ExecuteScalarAsync(ct) as string;
-    }
-
-    public async Task SaveChatCompletionAsync(string cacheKey, string model, decimal temperature, string responseText, CancellationToken ct)
-    {
-        const string sql = """
-            IF NOT EXISTS (SELECT 1 FROM RagChatCompletionCache WHERE CacheKey = @CacheKey)
-            INSERT INTO RagChatCompletionCache (CacheKey, Model, Temperature, ResponseText, CreatedAt)
-            VALUES (@CacheKey, @Model, @Temperature, @ResponseText, SYSUTCDATETIME())
-            """;
-        await using var connection = new SqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
-        await using var command = new SqlCommand(sql, connection);
-        command.Parameters.AddWithValue("@CacheKey", cacheKey);
-        command.Parameters.AddWithValue("@Model", model);
-        command.Parameters.AddWithValue("@Temperature", temperature);
-        command.Parameters.AddWithValue("@ResponseText", responseText);
-        await command.ExecuteNonQueryAsync(ct);
-    }
-
-    private static RagDocumentRecord ReadDocument(SqlDataReader reader, int offset = 0) => new()
-    {
-        Id = reader.GetString(offset),
-        DocumentType = reader.GetString(offset + 1),
-        Title = reader.GetString(offset + 2),
-        SourceUrl = reader.IsDBNull(offset + 3) ? null : reader.GetString(offset + 3),
-        Text = reader.GetString(offset + 4),
-        TextHash = reader.GetString(offset + 5),
-        TypeConfidence = Convert.ToDouble(reader.GetValue(offset + 6)),
-        MetadataJson = reader.GetString(offset + 7),
-        CreatedAt = new DateTimeOffset(reader.GetDateTime(offset + 8), TimeSpan.Zero)
-    };
-    private async Task EnsureDatabaseExistsAsync(CancellationToken ct)
-    {
-        var builder = new SqlConnectionStringBuilder(_connectionString);
-        var databaseName = builder.InitialCatalog;
-        if (string.IsNullOrWhiteSpace(databaseName)) return;
-
-        builder.InitialCatalog = "master";
-        await using var connection = new SqlConnection(builder.ConnectionString);
-        await connection.OpenAsync(ct);
-        var safeName = databaseName.Replace("]", "]]" );
-        await using var command = new SqlCommand($"IF DB_ID(@DatabaseName) IS NULL EXEC('CREATE DATABASE [{safeName}]')", connection);
-        command.Parameters.AddWithValue("@DatabaseName", databaseName);
-        await command.ExecuteNonQueryAsync(ct);
-    }
-
-}
@@ -11,7 +11,11 @@
    <PackageReference Include="Azure.Extensions.AspNetCore.Configuration.Secrets" Version="1.5.1" />
    <PackageReference Include="Azure.Identity" Version="1.21.0" />
    <PackageReference Include="DotNetEnv" Version="3.2.0" />
-    <PackageReference Include="Microsoft.Data.SqlClient" Version="6.1.3" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="10.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.0">
+      <PrivateAssets>all</PrivateAssets>
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