Aug 5 - Update code to follow up ST - MT14b

app/models/inspection_schedule.py

@@ -171,6 +171,21 @@ class InspectionSchedule(db.Model):
         nullable=True, index=True,
     )
 
+    # ── Receipt acknowledgement (phase50) ────────────────────────────────────
+    # Stamped when the assigned inspector confirms they received the request.
+    # NULL = awaiting confirmation.
+    #
+    # Per ASSIGNMENT, not per occurrence: fulfill() and advance_due_date()
+    # deliberately leave this alone as the schedule rolls forward, so an
+    # inspector who confirmed "yes, this weekly round is mine" is not asked
+    # again every week. The edit route resets it to NULL on reassignment to a
+    # DIFFERENT inspector, who has confirmed nothing.
+    #
+    # The acknowledger is always `inspector` — the only person the routes let
+    # confirm — so no separate acknowledged_by column is needed. Only meaningful
+    # for mode='plan'; an auto schedule has no request to receive.
+    acknowledged_at = db.Column(db.DateTime, nullable=True)
+
     created_by   = db.Column(
         db.Integer, db.ForeignKey('users.id', ondelete='SET NULL'),
         nullable=True
@@ -228,6 +243,11 @@ class InspectionSchedule(db.Model):
         """True when this schedule was created to follow up an inspection."""
         return self.parent_inspection_id is not None
 
+    @property
+    def is_acknowledged(self):
+        """True once the assigned inspector has confirmed receipt (phase50)."""
+        return self.acknowledged_at is not None
+
     FREQUENCY_LABELS = {
         'once':        'One-time',
         'daily':       'Daily',