feat(db): add indexes on documents.user_id and documents.filename

Author: Lalitha-Kalle

backend/app/models.py

@@ -233,7 +233,7 @@ class Document(Base):
 
     id = Column(GUID, primary_key=True, default=uuid.uuid4)
     user_id = Column(GUID, ForeignKey("users.id"), nullable=False, index=True)
-    filename = Column(String(255), nullable=False)
+    filename = Column(String(255), nullable=False, index=True)
     original_name = Column(String(255), nullable=False)
     file_size = Column(Integer, default=0)
     page_count = Column(Integer, default=0)

backend/migrate_add_indexes_document.py

@@ -0,0 +1,29 @@
+"""
+One-time migration script to add indexes on documents.user_id and documents.filename.
+Run this from the 'backend' directory.
+"""
+import sys
+import os
+
+sys.path.append(os.path.dirname(os.path.abspath(__file__)))
+
+from app.database import engine
+from sqlalchemy import text
+
+def migrate():
+    print("🚀 Starting migration: adding indexes on 'documents' table...")
+    try:
+        with engine.connect() as conn:
+            conn.execute(text(
+                "CREATE INDEX IF NOT EXISTS ix_documents_user_id ON documents (user_id)"
+            ))
+            conn.execute(text(
+                "CREATE INDEX IF NOT EXISTS ix_documents_filename ON documents (filename)"
+            ))
+            conn.commit()
+        print("✅ Migration successful!")
+    except Exception as e:
+        print(f"❌ Migration failed: {e}")
+
+if __name__ == "__main__":
+    migrate()