improve timezone discovery

backend/alembic/versions/46a2e388b20a_add_timezone_to_participant.py

@@ -0,0 +1,29 @@
+"""add timezone to participant
+
+Revision ID: 46a2e388b20a
+Revises: 001
+Create Date: 2026-01-28 18:48:09.141869
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = '46a2e388b20a'
+down_revision: Union[str, None] = '001'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('participants', sa.Column('timezone', sa.String(length=50), nullable=False, server_default='UTC'))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('participants', 'timezone')
+    # ### end Alembic commands ###