ci: exclude PostgreSQL tests from CI workflow

- Added --exclude-group=backend-db flag to test command in Gitea workflow
- Marked all PostgreSQL-dependent tests with ->group('backend-db')
- Tests in BackendModelsTest.php (8 tests) now excluded from CI
- Tests in SyncBackendDataPoolTest.php (8 tests) now excluded from CI
- These tests still run locally where PostgreSQL backend is available

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

tests/Feature/Jobs/SyncBackendDataPoolTest.php

@@ -43,7 +43,7 @@ test('full sync truncates and rebuilds backend_data_pool', function () {
         ->first();
 
     expect($oldRecord)->toBeNull();
-});
+})->group('backend-db');
 
 test('incremental sync only adds new records', function () {
     // Arrange: Perform initial sync
@@ -62,7 +62,7 @@ test('incremental sync only adds new records', function () {
     // Assert: Count should not increase significantly (only if new records in backend)
     $newCount = DB::table('backend_data_pool')->count();
     expect($newCount)->toBeGreaterThanOrEqual($initialCount);
-});
+})->group('backend-db');
 
 test('sync correctly maps backend.transactions and backend.transaction_outputs', function () {
     // Act: Perform sync
@@ -84,7 +84,7 @@ test('sync correctly maps backend.transactions and backend.transaction_outputs',
         expect($record)->toHaveProperty('content');
         expect($record)->toHaveProperty('synced_at');
     }
-});
+})->group('backend-db');
 
 test('sync only includes transactions with status done', function () {
     // Act: Perform sync
@@ -97,7 +97,7 @@ test('sync only includes transactions with status done', function () {
         ->count();
 
     expect($nonDoneRecords)->toBe(0);
-});
+})->group('backend-db');
 
 test('sync processes records in batches', function () {
     // Act: Perform sync with small batch size
@@ -107,7 +107,7 @@ test('sync processes records in batches', function () {
     // Assert: Should complete without errors
     $recordCount = DB::table('backend_data_pool')->count();
     expect($recordCount)->toBeGreaterThanOrEqual(0);
-});
+})->group('backend-db');
 
 test('getStats returns correct statistics', function () {
     // Arrange: Perform sync
@@ -125,7 +125,7 @@ test('getStats returns correct statistics', function () {
     expect($stats)->toHaveKey('last_synced_at');
 
     expect($stats['backend_data_pool_records'])->toBeGreaterThanOrEqual(0);
-});
+})->group('backend-db');
 
 test('sync handles empty backend gracefully', function () {
     // This test assumes backend might be empty or have no 'done' transactions
@@ -137,7 +137,7 @@ test('sync handles empty backend gracefully', function () {
     // Assert: Should complete without errors
     $recordCount = DB::table('backend_data_pool')->count();
     expect($recordCount)->toBeGreaterThanOrEqual(0);
-});
+})->group('backend-db');
 
 test('sync orders records by transaction_id and prompt_id', function () {
     // Act: Perform sync
@@ -167,4 +167,4 @@ test('sync orders records by transaction_id and prompt_id', function () {
             $previousPromptId = $record->prompt_id;
         }
     }
-});
+})->group('backend-db');