fix: add keywords column to Document model and database migrations to fix 500 error on list documents

Author: param20h

backend/app/database.py

@@ -198,6 +198,7 @@ def _migrate_schema():
         ("documents", "processing_started_at", "ALTER TABLE documents ADD COLUMN processing_started_at TIMESTAMP"),
         ("documents", "completed_at", "ALTER TABLE documents ADD COLUMN completed_at TIMESTAMP"),
         ("documents", "extracted_urls", "ALTER TABLE documents ADD COLUMN extracted_urls TEXT"),
+        ("documents", "keywords", "ALTER TABLE documents ADD COLUMN keywords TEXT"),
     ]
     for table, column, ddl in docs_migrations:
         if column not in existing_docs_columns:

backend/app/models.py

@@ -355,6 +355,7 @@ class Document(Base):
     processing_started_at = Column(DateTime, nullable=True)
     completed_at = Column(DateTime, nullable=True)
     extracted_urls = Column(Text, nullable=True)
+    keywords = Column(Text, nullable=True)
 
     # Relationships
     owner = relationship("User", back_populates="documents")