fix: incorrect update date in kb card

src/langbot/pkg/persistence/migrations/dbm013_knowledge_base_updated_at.py

@@ -0,0 +1,49 @@
+import sqlalchemy
+from .. import migration
+
+
+@migration.migration_class(13)
+class DBMigrateKnowledgeBaseUpdatedAt(migration.DBMigration):
+    """Add updated_at field to knowledge_bases table"""
+
+    async def upgrade(self):
+        """Upgrade"""
+        # Get all column names from the table
+        columns = []
+
+        if self.ap.persistence_mgr.db.name == 'postgresql':
+            result = await self.ap.persistence_mgr.execute_async(
+                sqlalchemy.text(
+                    "SELECT column_name FROM information_schema.columns WHERE table_name = 'knowledge_bases';"
+                )
+            )
+            all_result = result.fetchall()
+            columns = [row[0] for row in all_result]
+        else:
+            result = await self.ap.persistence_mgr.execute_async(sqlalchemy.text('PRAGMA table_info(knowledge_bases);'))
+            all_result = result.fetchall()
+            columns = [row[1] for row in all_result]
+
+        # Check and add updated_at column
+        if 'updated_at' not in columns:
+            if self.ap.persistence_mgr.db.name == 'postgresql':
+                await self.ap.persistence_mgr.execute_async(
+                    sqlalchemy.text(
+                        'ALTER TABLE knowledge_bases ADD COLUMN updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP'
+                    )
+                )
+            else:
+                # SQLite doesn't support DEFAULT CURRENT_TIMESTAMP in ALTER TABLE
+                # Add column without default first
+                await self.ap.persistence_mgr.execute_async(
+                    sqlalchemy.text('ALTER TABLE knowledge_bases ADD COLUMN updated_at DATETIME')
+                )
+
+            # Set initial updated_at values to created_at for existing records
+            await self.ap.persistence_mgr.execute_async(
+                sqlalchemy.text('UPDATE knowledge_bases SET updated_at = created_at WHERE updated_at IS NULL')
+            )
+
+    async def downgrade(self):
+        """Downgrade"""
+        pass