Add schedule post live-update and old post deletion (#40, #41)

- Store schedule message timestamp in DynamoDB (SCHEDULE_POST record)
- Delete previous week's schedule post before posting the new one
- Live-update the schedule post via chat_update after any
  pick/drop/swap/button-pickup so it always reflects current state

src/shared/python/shared/schedule.py

@@ -142,6 +142,26 @@ class ShiftSchedule:
 
         return (FALLBACK_EXTENSION, "Available", "available")
 
+    # ── Schedule post tracking ───────────────────────────────────────────
+
+    def get_schedule_post(self, channel_id: str) -> dict | None:
+        resp = self.table.get_item(
+            Key={"PK": "SCHEDULE_POST", "SK": channel_id}
+        )
+        return resp.get("Item")
+
+    def save_schedule_post(
+        self, channel_id: str, message_ts: str, week_start: str
+    ) -> None:
+        self.table.put_item(
+            Item={
+                "PK": "SCHEDULE_POST",
+                "SK": channel_id,
+                "message_ts": message_ts,
+                "week_start": week_start,
+            }
+        )
+
     # ── Pay records ─────────────────────────────────────────────────────
 
     def get_pay_record(self, week_key: str) -> dict | None:

src/slack-bot/app.py

@@ -185,6 +185,29 @@ def create_app(
             blocks=blocks,
             text=f"Shift picked up for {date_str}",
         )
+        _refresh_schedule_post(client)
+
+    def _refresh_schedule_post(client):
+        """Update the pinned schedule message in-place after a shift change."""
+        channel = schedule_channel
+        if not channel:
+            return
+        post = schedule.get_schedule_post(channel)
+        if not post or not post.get("message_ts"):
+            return
+        try:
+            blocks = build_week_schedule(schedule)
+            now = datetime.now(EASTERN)
+            this_monday = now - timedelta(days=now.weekday())
+            end_date = this_monday + timedelta(days=13)
+            client.chat_update(
+                channel=channel,
+                ts=post["message_ts"],
+                blocks=blocks,
+                text=f"After-Hours Schedule — {now.strftime('%b %-d')} to {end_date.strftime('%b %-d')}",
+            )
+        except Exception:
+            logger.warning("Could not update schedule post", exc_info=True)
 
     # ── Subcommand handlers ─────────────────────────────────────────────
 
@@ -350,6 +373,7 @@ def create_app(
             )
         except Exception:
             logger.exception("Failed to post pickup notification to channel")
+        _refresh_schedule_post(client)
 
     def _handle_drop(respond, schedule, user_id, text, channel_id, client):
         parts = text.split(maxsplit=1)
@@ -395,6 +419,7 @@ def create_app(
             )
         except Exception:
             logger.exception("Failed to post drop notification to channel")
+        _refresh_schedule_post(client)
 
     def _handle_swap(respond, schedule, user_id, text, channel_id, client):
         # Expected format: swap <date> @user  OR  swap <date> <extension>
@@ -466,5 +491,6 @@ def create_app(
             )
         except Exception:
             logger.exception("Failed to post swap notification to channel")
+        _refresh_schedule_post(client)
 
     return app

src/weekly-post/app.py

@@ -189,20 +189,33 @@ def handler(event, context):
         # Email pay summary to payroll
         _send_pay_email(week_label, pay_record)
 
+    # --- Delete previous week's schedule post ---
+    old_post = schedule.get_schedule_post(channel_id)
+    if old_post and old_post.get("message_ts"):
+        try:
+            slack.chat_delete(channel=channel_id, ts=old_post["message_ts"])
+            logger.info("Deleted previous schedule post %s", old_post["message_ts"])
+        except Exception:
+            logger.warning("Could not delete old schedule post", exc_info=True)
+
     # --- Two-week schedule (always starts on Monday of this week) ---
     this_monday = now - timedelta(days=now.weekday())
     blocks = build_week_schedule(schedule, start_date=this_monday)
 
     end_date = this_monday + timedelta(days=13)
-    slack.chat_postMessage(
+    result = slack.chat_postMessage(
         channel=channel_id,
         blocks=blocks,
         text=f"After-Hours Schedule — {now.strftime('%b %-d')} to {end_date.strftime('%b %-d')}",
     )
 
-    logger.info("Posted weekly schedule to channel %s", channel_id)
+    schedule.save_schedule_post(
+        channel_id, result["ts"], this_monday.strftime("%Y-%m-%d")
+    )
+    logger.info("Posted weekly schedule to channel %s (ts=%s)", channel_id, result["ts"])
     return {
         "posted": True,
         "channel": channel_id,
+        "message_ts": result["ts"],
         "pay_calculated": bool(pay_record["breakdown"]),
     }