refactor(db): migrate cover letter history

Move append-only cover letter revisions into an additive provider-aware migration. Preserve manual and AI text, source metadata, ordering, and application cascade semantics.
2026-08-30 18:55:20 +02:00
parent e933409698
commit 934b35a1e0
10 changed files with 137 additions and 47 deletions
@@ -0,0 +1,64 @@
+using System;
+using JobTrackerApi.Data;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace JobTrackerApi.Migrations;
+
+/// <summary>
+/// Moves append-only cover-letter revision history into migration ownership without replacing
+/// manually edited or AI-approved document versions.
+/// </summary>
+[DbContext(typeof(JobTrackerContext))]
+[Migration("20260830131000_AdoptCoverLetterVersionSchema")]
+public sealed class AdoptCoverLetterVersionSchema : Migration
+{
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+        if (ActiveProvider.Contains("MySql", StringComparison.OrdinalIgnoreCase))
+        {
+            migrationBuilder.Sql("""
+                CREATE TABLE IF NOT EXISTS `CoverLetterVersions` (
+                    `Id` int NOT NULL AUTO_INCREMENT,
+                    `OwnerUserId` varchar(255) NOT NULL,
+                    `JobApplicationId` int NOT NULL,
+                    `Version` int NOT NULL,
+                    `Text` longtext NOT NULL,
+                    `Source` varchar(32) NOT NULL,
+                    `AiAction` varchar(32) NULL,
+                    `CreatedAtUtc` datetime(6) NOT NULL,
+                    PRIMARY KEY (`Id`),
+                    CONSTRAINT `FK_CoverLetterVersions_JobApplications_JobApplicationId`
+                        FOREIGN KEY (`JobApplicationId`) REFERENCES `JobApplications` (`Id`) ON DELETE CASCADE
+                ) CHARACTER SET=utf8mb4;
+                CREATE INDEX IF NOT EXISTS `IX_CoverLetterVersions_Owner_Job_Version`
+                    ON `CoverLetterVersions` (`OwnerUserId`, `JobApplicationId`, `Version`);
+                """);
+            return;
+        }
+
+        migrationBuilder.Sql("""
+            CREATE TABLE IF NOT EXISTS "CoverLetterVersions" (
+                "Id" INTEGER NOT NULL CONSTRAINT "PK_CoverLetterVersions" PRIMARY KEY AUTOINCREMENT,
+                "OwnerUserId" TEXT NOT NULL,
+                "JobApplicationId" INTEGER NOT NULL,
+                "Version" INTEGER NOT NULL,
+                "Text" TEXT NOT NULL,
+                "Source" TEXT NOT NULL,
+                "AiAction" TEXT NULL,
+                "CreatedAtUtc" TEXT NOT NULL,
+                CONSTRAINT "FK_CoverLetterVersions_JobApplications_JobApplicationId"
+                    FOREIGN KEY ("JobApplicationId") REFERENCES "JobApplications" ("Id") ON DELETE CASCADE
+            );
+            CREATE INDEX IF NOT EXISTS "IX_CoverLetterVersions_Owner_Job_Version"
+                ON "CoverLetterVersions" ("OwnerUserId", "JobApplicationId", "Version");
+            """);
+    }
+
+    protected override void Down(MigrationBuilder migrationBuilder)
+    {
+        // Preserve recoverable document history created before migration ownership.
+    }
+}