fix error in gitignore

apps/reservations/slot_service.py

@@ -0,0 +1,56 @@
+"""Dynamic slot generation.
+
+Slots are generated from runtime settings (working hours, slot duration,
+default capacity) and per-day `FacilitySchedule` overrides (capacity for the
+day, days off). Generation is idempotent — re-running updates existing slots
+instead of duplicating them.
+"""
+from datetime import datetime, timedelta
+
+from apps.core.settings_service import SettingsService
+from apps.reservations.models import FacilitySchedule, Slot
+
+
+class SlotService:
+    def generate_slots(self, facility, day, line=None) -> int:
+        schedule = FacilitySchedule.objects.filter(facility=facility, date=day).first()
+        if schedule is not None and not schedule.is_open:
+            return 0  # day off
+
+        service = SettingsService()
+        if schedule is not None and schedule.start_time:
+            start_str = schedule.start_time.strftime("%H:%M")
+        else:
+            start_str = service.get("reservation.working_hours_start", "08:00")
+        if schedule is not None and schedule.end_time:
+            end_str = schedule.end_time.strftime("%H:%M")
+        else:
+            end_str = service.get("reservation.working_hours_end", "17:00")
+        duration = int(service.get("reservation.slot_duration_minutes", 30))
+        if schedule is not None:
+            capacity = schedule.capacity
+        else:
+            capacity = int(service.get("reservation.default_capacity", 2))
+
+        if duration <= 0:
+            raise ValueError("Slot duration must be positive.")
+
+        start_t = datetime.strptime(start_str, "%H:%M").time()
+        end_t = datetime.strptime(end_str, "%H:%M").time()
+        current = datetime.combine(day, start_t)
+        end_dt = datetime.combine(day, end_t)
+
+        created = 0
+        while current + timedelta(minutes=duration) <= end_dt:
+            slot_end = (current + timedelta(minutes=duration)).time()
+            _, was_created = Slot.objects.update_or_create(
+                facility=facility,
+                line=line,
+                date=day,
+                start_time=current.time(),
+                defaults={"end_time": slot_end, "capacity": capacity},
+            )
+            if was_created:
+                created += 1
+            current += timedelta(minutes=duration)
+        return created