timezone fix migration

alembic/versions/34aaf324bd00_time_fix.py

@@ -0,0 +1,33 @@
+"""time fix
+
+Revision ID: 34aaf324bd00
+Revises: 56affd716c7c
+Create Date: 2026-01-05 18:38:17.290937
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel
+
+
+# revision identifiers, used by Alembic.
+revision: str = '34aaf324bd00'
+down_revision: Union[str, Sequence[str], None] = '56affd716c7c'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    pass
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    pass
+    # ### end Alembic commands ###

src/api/models/chat.py

@@ -33,6 +33,6 @@ class ChatMessage(SQLModel, table=True):
     id: Optional[int] = Field(default=None, primary_key=True)
     content: str = Field(sa_type=Text)
     role: ChatMessageRole = Field(index=True)
-    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    timestamp: datetime = Field(default_factory=utc_now)
     session_id: uuid.UUID = Field(foreign_key="chat_sessions.id")
     session: ChatSession = Relationship(back_populates="messages")

src/api/selectors/chat/save_messages.py

@@ -3,7 +3,6 @@ from sqlmodel import select, delete
 from src.api.models.chat import ChatSession, ChatMessage, ChatMessageRole
 from llama_index.core.llms import ChatMessage as LlamaChatMessage, MessageRole
 from typing import List
-from datetime import datetime, timezone
 
 def llama_to_db_role(llama_role: MessageRole) -> ChatMessageRole:
     mapping = {
@@ -26,7 +25,6 @@ async def save_messages_to_db(
         await db.commit()
     
     db_messages = []
-    now = datetime.now(timezone.utc)
     for i, msg in enumerate(messages):
         db_message = ChatMessage(
             content=str(msg.content),