Mark existing bank-synced transactions as Cleared on startup

One-time migration: UPDATE all transactions that have a FitId
(bank-synced) and Status=Uncleared to Status=Cleared. Tracked
in data_migrations table so it only runs once.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/Purrse.Api/Program.cs

@@ -119,8 +119,25 @@ using (var scope = app.Services.CreateScope())
     await db.Database.MigrateAsync();
 }
 
-// One-time data migration: split SimpleFIN connections by institution
+// One-time data migrations
 await SimpleFinConnectionMigration.RunAsync(app.Services, app.Services.GetRequiredService<ILogger<Program>>());
+using (var scope = app.Services.CreateScope())
+{
+    var db = scope.ServiceProvider.GetRequiredService<PurrseDbContext>();
+    await db.Database.ExecuteSqlRawAsync(
+        "CREATE TABLE IF NOT EXISTS data_migrations (name TEXT PRIMARY KEY, applied_at TIMESTAMP NOT NULL)");
+    var applied = await db.Database.SqlQueryRaw<int>(
+        "SELECT 1 AS \"Value\" FROM data_migrations WHERE name = 'ClearSyncedTransactions'").AnyAsync();
+    if (!applied)
+    {
+        var count = await db.Database.ExecuteSqlRawAsync(
+            "UPDATE \"Transactions\" SET \"Status\" = 1 WHERE \"FitId\" IS NOT NULL AND \"Status\" = 0");
+        if (count > 0)
+            app.Services.GetRequiredService<ILogger<Program>>().LogInformation("Marked {Count} bank-synced transactions as Cleared", count);
+        await db.Database.ExecuteSqlRawAsync(
+            "INSERT INTO data_migrations (name, applied_at) VALUES ('ClearSyncedTransactions', NOW()) ON CONFLICT DO NOTHING");
+    }
+}
 
 // Initialize plugin system
 var pluginService = app.Services.GetRequiredService<PluginService>();