First commit

migrations/versions/phase14_facility_created_at.py

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+"""phase14 — add created_at to facilities
+
+Adds a nullable DateTime column to the facilities table so that facility
+creation time is tracked consistently with every other core model.
+
+Existing rows receive NULL (unknown creation time) — nullable=True is
+intentional for backward compatibility with pre-existing data.
+
+Revision ID: phase14_facility_created_at
+Revises: phase13_issue_facility
+"""
+
+revision      = 'phase14_facility_created_at'
+down_revision = 'phase13_issue_facility'
+branch_labels = None
+depends_on    = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    with op.batch_alter_table('facilities') as batch_op:
+        batch_op.add_column(
+            sa.Column('created_at', sa.DateTime(), nullable=True)
+        )
+
+
+def downgrade():
+    with op.batch_alter_table('facilities') as batch_op:
+        batch_op.drop_column('created_at')