05/27 Update template toggle function

migrations/versions/phase21_template_active.py

@@ -0,0 +1,39 @@
+"""phase21 — template active flag
+
+Adds `active` boolean column to `inspection_templates` so templates can be
+deactivated without deletion.  Inactive templates are hidden from the
+inspection-start form but remain accessible in the template management UI.
+
+Safe to re-run — uses INFORMATION_SCHEMA column existence check.
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision      = 'phase21_template_active'
+down_revision = 'phase20_inspector_assignments'
+branch_labels = None
+depends_on    = None
+
+
+def _column_exists(bind, table, column):
+    result = bind.execute(sa.text(
+        "SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS "
+        "WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = :t AND COLUMN_NAME = :c"
+    ), {"t": table, "c": column})
+    return result.scalar() > 0
+
+
+def upgrade():
+    bind = op.get_bind()
+    if not _column_exists(bind, 'inspection_templates', 'active'):
+        op.add_column(
+            'inspection_templates',
+            sa.Column('active', sa.Boolean(), nullable=False, server_default=sa.true())
+        )
+
+
+def downgrade():
+    bind = op.get_bind()
+    if _column_exists(bind, 'inspection_templates', 'active'):
+        op.drop_column('inspection_templates', 'active')