first cleanup iter

app/discord/pending.py

@@ -0,0 +1,102 @@
+"""Persistence of pending reaction-request mappings across bot restarts.
+
+The bot uses reaction messages (✅ / ❌) on DMs to let a coach approve or reject
+a one-on-one request without visiting the site. The mapping from Discord
+message_id → {request_type, primary_key} is stored in a JSON file so that a
+bot restart does not orphan reactions that were already sent.
+"""
+
+import json
+import logging
+import os
+from datetime import UTC, datetime
+
+from app.discord.constants import PENDING_MAX_AGE_DAYS
+from app.discord.queue import enqueue
+
+_logger = logging.getLogger(__name__)
+
+#: File for persisting pending requests across bot restarts.
+PENDING_FILE = os.path.join(
+    os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))),
+    'discord_pending.json',
+)
+
+
+def load_pending() -> dict:
+    """Load pending requests from the JSON file.
+
+    Returns:
+        dict mapping message_id (int) → entry dict.
+    """
+    if not os.path.exists(PENDING_FILE):
+        return {}
+    try:
+        with open(PENDING_FILE, encoding='utf-8') as f:
+            entries = json.load(f)
+    except (json.JSONDecodeError, OSError):
+        _logger.warning('Could not read pending file, starting empty.', exc_info=True)
+        return {}
+    if not isinstance(entries, dict):
+        return {}
+    cleaned = drop_expired(entries)
+    if len(cleaned) < len(entries):
+        save_pending(cleaned)
+    return cleaned
+
+
+def drop_expired(entries: dict) -> dict:
+    """Remove entries whose creation timestamp is too old.
+
+    Args:
+        entries: dict mapping message_id → entry.
+
+    Returns:
+        Filtered dict.
+    """
+    now = datetime.now(UTC).timestamp()
+    cutoff = now - PENDING_MAX_AGE_DAYS * 86400
+    return {mid: e for mid, e in entries.items() if e.get('created_at', 0) >= cutoff}
+
+
+def save_pending(entries: dict) -> None:
+    """Persist pending entries to the JSON file."""
+    try:
+        with open(PENDING_FILE, 'w', encoding='utf-8') as f:
+            json.dump(entries, f, indent=2)
+    except OSError:
+        _logger.exception('Could not write pending file')
+
+
+def forget_pending(entries: dict, message_id: int) -> dict:
+    """Remove one message from the pending map and persist.
+
+    Args:
+        entries: The current pending map.
+        message_id: The message whose entry to remove.
+
+    Returns:
+        Updated dict (already persisted).
+    """
+    entries.pop(str(message_id), None)
+    save_pending(entries)
+    return entries
+
+
+def purge_pending_for_participants(participant_ids: list[int]) -> None:
+    """Queue a purge of stale participant pending entries.
+
+    Called after a match edit deletes participants. The bot thread removes
+    matching ``schedule_addition`` pending entries so that a reaction on an
+    old message cannot produce a false confirmation.
+
+    Args:
+        participant_ids: MatchParticipant primary keys that no longer exist.
+    """
+    if not participant_ids:
+        return
+    enqueue(
+        'purge_pending',
+        {'participant_ids': participant_ids},
+        description=f'purge of {len(participant_ids)} stale participant records',
+    )