Aug 3 - Update scheduled task acknowledged

migrations/versions/phase47_sched_acknowledged.py

@@ -0,0 +1,49 @@
+"""phase47 — scheduled inspection receipt acknowledgement
+
+Adds to `scheduled_inspections`:
+
+    acknowledged_at  DATETIME NULL
+
+When the assigned inspector confirms they have received/seen a scheduled
+inspection request. NULL = awaiting confirmation. Reset to NULL by the edit
+route when the schedule is reassigned to a different inspector (once per
+assignment, not per occurrence). The acknowledger is always the assigned
+inspector, so no separate acknowledged_by column is stored.
+
+No backfill: legacy rows keep NULL and render as "awaiting confirmation", which
+is the correct initial state for an assignment nobody has confirmed yet.
+
+Uses INFORMATION_SCHEMA check — safe to re-run.
+"""
+
+revision      = 'phase47_sched_acknowledged'
+down_revision = 'phase46_followup_req_by'
+branch_labels = None
+depends_on    = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def _column_exists(conn, table, column):
+    return conn.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}).scalar() > 0
+
+
+def upgrade():
+    bind = op.get_bind()
+    if not _column_exists(bind, 'scheduled_inspections', 'acknowledged_at'):
+        op.execute(sa.text(
+            "ALTER TABLE scheduled_inspections ADD COLUMN acknowledged_at DATETIME NULL"
+        ))
+
+
+def downgrade():
+    bind = op.get_bind()
+    if _column_exists(bind, 'scheduled_inspections', 'acknowledged_at'):
+        op.execute(sa.text(
+            "ALTER TABLE scheduled_inspections DROP COLUMN acknowledged_at"
+        ))