Fix sunrise window logging and Mattermost cleanup scope

daily_sunrise_video.sh:
- Fix "Sunrise (UTC)" label — sunrise.py has always returned local time;
  now labelled correctly as "Sunrise (local)"
- After image selection, log first and last frame timestamps alongside the
  overlay time so the window can be verified at a glance:
    Images: 481  (05:22:10 → 06:43:00  overlay: 06:32)

sunrise2mm.py:
- Cleanup now only deletes posts whose message matches "Sunrise YYYY-MM-DD"
  (the format this script posts), so other posts with attachments in the
  channel are never touched

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ

daily_sunrise_video.sh

@@ -54,9 +54,8 @@ if ! $TEST_MODE; then
         echo "Error: Failed to retrieve sunrise time."
         exit 1
     fi
-    echo "Sunrise (UTC): $sunrise_time"
+    echo "Sunrise (local): $sunrise_time"
     sunrise_time_local=$(TZ="$TIMEZONE" date -d "$sunrise_time" +"%H-%M-%S")
-    echo "Sunrise (local): $sunrise_time_local"
     SR_TIME=$(echo "$sunrise_time_local" | cut -d'-' -f1,2 | tr '-' ':')
 fi
 
@@ -111,7 +110,9 @@ if [ "${#images[@]}" -lt 1 ]; then
     echo "No images found."
     exit 1
 fi
-echo "Images: ${#images[@]}"
+first_t=$(basename "${images[0]}"  .jpg | tr '-' ':')
+last_t=$(basename  "${images[-1]}" .jpg | tr '-' ':')
+echo "Images: ${#images[@]}  (${first_t} → ${last_t}  overlay: ${SR_TIME})"
 
 # Concat list with explicit frame duration so each frame represents real elapsed
 # time.  Without this, all frames collapse to timestamp 0 → one-frame video.

sunrise2mm.py

@@ -146,6 +146,9 @@ while True:
             continue
         if not post.get('file_ids'):
             continue
+        # Only delete posts this script created — message starts with "Sunrise YYYY-MM-DD"
+        if not re.match(r'^Sunrise \d{4}-\d{2}-\d{2}', post.get('message', '')):
+            continue
         if post['create_at'] >= cutoff_ms:
             continue
         del_r = requests.delete(