Add datetime import and buffer for alembic log

src/backend/base/langflow/services/database/service.py

@@ -1,3 +1,4 @@
+from datetime import datetime
 import time
 from pathlib import Path
 from typing import TYPE_CHECKING
@@ -124,10 +125,16 @@ class DatabaseService(Service):
         # if not self.script_location.exists(): # this is not the correct way to check if alembic has been initialized
         # We need to check if the alembic_version table exists
         # if not, we need to initialize alembic
-        alembic_cfg = Config()
+        # stdout should be something like sys.stdout
+        # which is a buffer
+        # I don't want to output anything
+        # subprocess.DEVNULL is an int
+        buffer = open(self.script_location / "alembic.log", "w")
+        alembic_cfg = Config(stdout=buffer)
         # alembic_cfg.attributes["connection"] = session
         alembic_cfg.set_main_option("script_location", str(self.script_location))
         alembic_cfg.set_main_option("sqlalchemy.url", self.database_url)
+
         should_initialize_alembic = False
         with Session(self.engine) as session:
             # If the table does not exist it throws an error
@@ -150,6 +157,7 @@ class DatabaseService(Service):
         logger.info(f"Running DB migrations in {self.script_location}")
 
         try:
+            buffer.write(f"{datetime.now().isoformat()}: Checking migrations\n")
             command.check(alembic_cfg)
         except Exception as exc:
             if isinstance(exc, (util.exc.CommandError, util.exc.AutogenerateDiffsDetected)):
@@ -157,6 +165,7 @@ class DatabaseService(Service):
                 time.sleep(3)
 
         try:
+            buffer.write(f"{datetime.now().isoformat()}: Checking migrations\n")
             command.check(alembic_cfg)
         except util.exc.AutogenerateDiffsDetected as exc:
             logger.error(f"AutogenerateDiffsDetected: {exc}")