Срочные улучшения: проверка занятости слота, автоочистка cancelled записей

app/services/booking_service.py

@@ -4,7 +4,11 @@ from app.db.memory import (
     get_user_bookings as db_get_user_bookings,
     cancel_booking as db_cancel_booking,
     update_booking as db_update_booking,
+    load_bookings as db_load_bookings,
+    save_bookings as db_save_bookings,
+    BOOKINGS_FILE,
 )
+from app.logger import logger
 
 
 async def create_booking(user_id, service, master, date, time):
@@ -25,3 +29,36 @@ async def cancel_booking(booking_id):
 
 async def update_booking(booking_id, service, master, date, time):
     return db_update_booking(booking_id, service, master, date, time)
+
+
+async def is_slot_busy(master, date, time):
+    """Check if a time slot is already taken by an active booking."""
+    busy = db_get_busy_times(master, date)
+    return time in busy
+
+
+def cleanup_cancelled():
+    """Remove cancelled bookings older than the head (keep only last 5 cancelled per user)."""
+    bookings = db_load_bookings()
+    active = [b for b in bookings if b["status"] == "active"]
+    cancelled = [b for b in bookings if b["status"] == "cancelled"]
+
+    # Group cancelled by user, keep last 5 per user
+    from collections import defaultdict
+    by_user = defaultdict(list)
+    for b in cancelled:
+        by_user[b["user_id"]].append(b)
+
+    keep_ids = set()
+    for uid, user_cancel in by_user.items():
+        # Keep the 5 most recent
+        user_cancel.sort(key=lambda x: x.get("id", 0), reverse=True)
+        for b in user_cancel[:5]:
+            keep_ids.add(b["id"])
+
+    # Rebuild: keep active + keep recent cancelled
+    bookings = active + [b for b in cancelled if b["id"] in keep_ids]
+    db_save_bookings(bookings)
+    removed = len(cancelled) - len(keep_ids)
+    if removed > 0:
+        logger.info("Cleaned up {n} old cancelled bookings", n=removed)