fix(api): align headlines schema and seeder with data model

The `headlines` table schema was missing the `status` and `type` columns inherited from its `FeedItem` base class. Additionally, the seeding logic was not correctly handling the nested `source` and `category` objects present in the `Headline` model, leading to a crash.

This change updates the `headlines` table schema to be a complete representation of the model. The seeding logic is refactored to correctly extract foreign key IDs from the nested objects and to ensure the parameter map sent to the database driver is perfectly aligned with the schema. This resolves the final seeding error.

Author: fulleni

lib/src/services/database_seeding_service.dart

@@ -114,6 +114,8 @@ class DatabaseSeedingService {
             content TEXT,
             created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
             updated_at TIMESTAMPTZ
+            status TEXT,
+            type TEXT
           );
         ''');
 
@@ -254,29 +256,35 @@ class DatabaseSeedingService {
         for (final data in headlinesFixturesData) {
           final headline = Headline.fromJson(data);
           final params = headline.toJson();
-
-          // The `source_id` and `category_id` columns are NOT NULL. If a
-          // fixture is missing these, the `toJson()` map will lack the key
-          // and cause a crash. We log a warning and skip the invalid entry.
-          if (params['source_id'] == null || params['category_id'] == null) {
+ 
+          // The `source_id` and `category_id` columns are NOT NULL. If a fixture
+          // is missing the nested source or category object, we cannot proceed.
+          if (headline.source == null || headline.category == null) {
             _log.warning(
               'Skipping headline fixture with missing source or category ID: '
               '${headline.title}',
             );
             continue;
           }
-
+ 
+          // Extract IDs from nested objects and remove the objects to match schema.
+          params['source_id'] = headline.source!.id;
+          params['category_id'] = headline.category!.id;
+          params.remove('source');
+          params.remove('category');
+ 
           // Ensure optional fields exist for the postgres driver.
           params.putIfAbsent('description', () => null);
           params.putIfAbsent('content', () => null);
           params.putIfAbsent('updated_at', () => null);
-
+ 
           await _connection.execute(
             Sql.named(
-              'INSERT INTO headlines (id, title, source_id, category_id, image_url, '
-              'url, published_at, description, content, created_at, updated_at) '
-              'VALUES (@id, @title, @source_id, @category_id, @image_url, @url, '
-              '@published_at, @description, @content, @created_at, @updated_at) '
+              'INSERT INTO headlines (id, title, source_id, category_id, '
+              'image_url, url, published_at, description, content, status, '
+              'type, created_at, updated_at) VALUES (@id, @title, @source_id, '
+              '@category_id, @image_url, @url, @published_at, @description, '
+              '@content, @status, @type, @created_at, @updated_at) '
               'ON CONFLICT (id) DO NOTHING',
             ),
             parameters: params,