feat: Add database cleanup functions for transactions and vertex builds (#4694)

* feat: Add configuration options for maximum transactions and vertex builds retention

* Add functions to clean up old transactions and vertex builds in the database

- Implement `clean_transactions` to delete transactions exceeding the configured limit.
- Implement `clean_vertex_builds` to delete vertex builds exceeding the configured limit.
- Integrate cleanup functions into the service initialization process.

* Add error handling and logging for cleanup tasks in utils.py

- Wrap transaction and vertex build cleanup operations in try-except blocks.
- Log success and error messages for cleanup operations.
- Rollback session on exceptions without re-raising, as these are cleanup tasks.
- Adjust service initialization order to ensure proper setup.

* Reorder setup and cleanup tasks in database initialization process

* fix: Update type hints for settings_service in cleanup functions

* Remove execution options in cleanup functions

* Handle specific exceptions during cleanup tasks in utils.py

* Use `col` for column references in delete statements to improve SQL query clarity.

src/backend/base/langflow/services/settings/base.py

@@ -173,6 +173,10 @@ class Settings(BaseSettings):
     """The maximum file size for the upload in MB."""
     deactivate_tracing: bool = False
     """If set to True, tracing will be deactivated."""
+    max_transactions_to_keep: int = 3000
+    """The maximum number of transactions to keep in the database."""
+    max_vertex_builds_to_keep: int = 3000
+    """The maximum number of vertex builds to keep in the database."""
 
     @field_validator("dev")
     @classmethod

src/backend/base/langflow/services/utils.py

@@ -1,17 +1,28 @@
+from __future__ import annotations
+
 import asyncio
+from typing import TYPE_CHECKING
 
 from loguru import logger
-from sqlmodel import select
+from sqlalchemy import delete
-from sqlmodel.ext.asyncio.session import AsyncSession
+from sqlalchemy import exc as sqlalchemy_exc
+from sqlmodel import col, select
 
 from langflow.services.auth.utils import create_super_user, verify_password
 from langflow.services.cache.factory import CacheServiceFactory
+from langflow.services.database.models.transactions.model import TransactionTable
+from langflow.services.database.models.vertex_builds.model import VertexBuildTable
 from langflow.services.database.utils import initialize_database
 from langflow.services.schema import ServiceType
 from langflow.services.settings.constants import DEFAULT_SUPERUSER, DEFAULT_SUPERUSER_PASSWORD
 
 from .deps import get_db_service, get_service, get_settings_service
 
+if TYPE_CHECKING:
+    from sqlmodel.ext.asyncio.session import AsyncSession
+
+    from langflow.services.settings.manager import SettingsService
+
 
 async def get_or_create_super_user(session: AsyncSession, username, password, is_default):
     from langflow.services.database.models.user.model import User
@@ -157,6 +168,70 @@ def initialize_session_service() -> None:
     )
 
 
+async def clean_transactions(settings_service: SettingsService, session: AsyncSession) -> None:
+    """Clean up old transactions from the database.
+
+    This function deletes transactions that exceed the maximum number to keep (configured in settings).
+    It orders transactions by timestamp descending and removes the oldest ones beyond the limit.
+
+    Args:
+        settings_service: The settings service containing configuration like max_transactions_to_keep
+        session: The database session to use for the deletion
+
+    Returns:
+        None
+    """
+    try:
+        # Delete transactions using bulk delete
+        delete_stmt = delete(TransactionTable).where(
+            col(TransactionTable.id).in_(
+                select(TransactionTable.id)
+                .order_by(col(TransactionTable.timestamp).desc())
+                .offset(settings_service.settings.max_transactions_to_keep)
+            )
+        )
+
+        await session.exec(delete_stmt)
+        await session.commit()
+        logger.debug("Successfully cleaned up old transactions")
+    except (sqlalchemy_exc.SQLAlchemyError, asyncio.TimeoutError) as exc:
+        logger.error(f"Error cleaning up transactions: {exc!s}")
+        await session.rollback()
+        # Don't re-raise since this is a cleanup task
+
+
+async def clean_vertex_builds(settings_service: SettingsService, session: AsyncSession) -> None:
+    """Clean up old vertex builds from the database.
+
+    This function deletes vertex builds that exceed the maximum number to keep (configured in settings).
+    It orders vertex builds by timestamp descending and removes the oldest ones beyond the limit.
+
+    Args:
+        settings_service: The settings service containing configuration like max_vertex_builds_to_keep
+        session: The database session to use for the deletion
+
+    Returns:
+        None
+    """
+    try:
+        # Delete vertex builds using bulk delete
+        delete_stmt = delete(VertexBuildTable).where(
+            col(VertexBuildTable.id).in_(
+                select(VertexBuildTable.id)
+                .order_by(col(VertexBuildTable.timestamp).desc())
+                .offset(settings_service.settings.max_vertex_builds_to_keep)
+            )
+        )
+
+        await session.exec(delete_stmt)
+        await session.commit()
+        logger.debug("Successfully cleaned up old vertex builds")
+    except (sqlalchemy_exc.SQLAlchemyError, asyncio.TimeoutError) as exc:
+        logger.error(f"Error cleaning up vertex builds: {exc!s}")
+        await session.rollback()
+        # Don't re-raise since this is a cleanup task
+
+
 async def initialize_services(*, fix_migration: bool = False) -> None:
     """Initialize all the services needed."""
     # Test cache connection
@@ -164,10 +239,13 @@ async def initialize_services(*, fix_migration: bool = False) -> None:
     # Setup the superuser
     await asyncio.to_thread(initialize_database, fix_migration=fix_migration)
     async with get_db_service().with_async_session() as session:
-        await setup_superuser(get_service(ServiceType.SETTINGS_SERVICE), session)
+        settings_service = get_service(ServiceType.SETTINGS_SERVICE)
+        await setup_superuser(settings_service, session)
     try:
         await get_db_service().assign_orphaned_flows_to_superuser()
     except Exception as exc:
         msg = "Error assigning orphaned flows to the superuser"
         logger.exception(msg)
         raise RuntimeError(msg) from exc
+    await clean_transactions(settings_service, session)
+    await clean_vertex_builds(settings_service, session)