Merge c575fb223b into d982b3a782

* perf(util): use monotonic clock and bounded deque in EventsPerSecond

EventsPerSecond is updated on every captured frame, every detection and
every processed frame across all cameras and detectors. The previous
implementation derived timestamps from datetime.now().timestamp() (wall
clock), so an NTP or manual clock adjustment could skew the rolling-window
expiry; it also stored timestamps in a list and expired them with
del self._timestamps[0] (O(n) per removal) plus a periodic slice-copy to
cap growth.

Switch to time.monotonic() for the interval math (correct by construction
and immune to wall-clock jumps) and a collections.deque(maxlen=...) so
expiry is O(1) (popleft) and retention is bounded automatically. This
mirrors the deque-based expiry already used in video/ffmpeg.py and
watchdog.py. Observable output is unchanged.

Adds frigate/test/test_builtin.py covering rate calculation, window
expiry and the memory bound.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* test: drop test_timestamps_are_memory_bounded

It only asserted that deque(maxlen=) caps length, which is stdlib behavior
rather than something this change needs to verify.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frigate/api/event.py

@@ -389,82 +389,106 @@ def events_explore(
     limit: int = 10,
     allowed_cameras: List[str] = Depends(get_allowed_cameras_for_filter),
 ):
-    # get distinct labels for all events
+    if not allowed_cameras:
-    distinct_labels = (
+        return JSONResponse(content=[])
-        Event.select(Event.label)
+
-        .where(Event.camera << allowed_cameras)
+    explore_columns = (
-        .distinct()
+        Event.id,
-        .order_by(Event.label)
+        Event.camera,
+        Event.label,
+        Event.sub_label,
+        Event.zones,
+        Event.start_time,
+        Event.end_time,
+        Event.has_clip,
+        Event.has_snapshot,
+        Event.plus_id,
+        Event.retain_indefinitely,
+        Event.top_score,
+        Event.false_positive,
+        Event.box,
+        Event.data,
     )
 
-    label_counts = {}
+    # Single query: per-label COUNT and top-N ranking by start_time computed
-
+    # via window functions in a CTE, then filtered to rn <= limit
-    def event_generator():
+    event_count = (
-        for label_obj in distinct_labels.iterator():
+        fn.COUNT(Event.id).over(partition_by=[Event.label]).alias("event_count")
-            label = label_obj.label
-
-            # get most recent events for this label
-            label_events = (
-                Event.select()
-                .where((Event.label == label) & (Event.camera << allowed_cameras))
-                .order_by(Event.start_time.desc())
-                .limit(limit)
-                .iterator()
-            )
-
-            # count total events for this label
-            label_counts[label] = (
-                Event.select()
-                .where((Event.label == label) & (Event.camera << allowed_cameras))
-                .count()
-            )
-
-            yield from label_events
-
-    def process_events():
-        for event in event_generator():
-            processed_event = {
-                "id": event.id,
-                "camera": event.camera,
-                "label": event.label,
-                "zones": event.zones,
-                "start_time": event.start_time,
-                "end_time": event.end_time,
-                "has_clip": event.has_clip,
-                "has_snapshot": event.has_snapshot,
-                "plus_id": event.plus_id,
-                "retain_indefinitely": event.retain_indefinitely,
-                "sub_label": event.sub_label,
-                "top_score": event.top_score,
-                "false_positive": event.false_positive,
-                "box": event.box,
-                "data": {
-                    k: v
-                    for k, v in event.data.items()
-                    if k
-                    in [
-                        "type",
-                        "score",
-                        "top_score",
-                        "description",
-                        "sub_label_score",
-                        "average_estimated_speed",
-                        "velocity_angle",
-                        "path_data",
-                        "recognized_license_plate",
-                        "recognized_license_plate_score",
-                    ]
-                },
-                "event_count": label_counts[event.label],
-            }
-            yield processed_event
-
-    # convert iterator to list and sort
-    processed_events = sorted(
-        process_events(),
-        key=lambda x: (x["event_count"], x["start_time"]),
-        reverse=True,
     )
+    rn = (
+        fn.ROW_NUMBER()
+        .over(partition_by=[Event.label], order_by=[Event.start_time.desc()])
+        .alias("rn")
+    )
+
+    base_query = Event.select(
+        *explore_columns,
+        event_count,
+        rn,
+    ).where(Event.camera << allowed_cameras)
+    ranked = base_query.cte("ranked")
+    query = (
+        Event.select(
+            ranked.c.id,
+            ranked.c.camera,
+            ranked.c.label,
+            ranked.c.sub_label,
+            ranked.c.zones,
+            ranked.c.start_time,
+            ranked.c.end_time,
+            ranked.c.has_clip,
+            ranked.c.has_snapshot,
+            ranked.c.plus_id,
+            ranked.c.retain_indefinitely,
+            ranked.c.top_score,
+            ranked.c.false_positive,
+            ranked.c.box,
+            ranked.c.data,
+            ranked.c.event_count,
+        )
+        .from_(ranked)
+        .with_cte(ranked)
+        .where(ranked.c.rn <= limit)
+        .order_by(ranked.c.event_count.desc(), ranked.c.start_time.desc())
+        .objects()
+    )
+
+    allowed_data_keys = {
+        "type",
+        "score",
+        "top_score",
+        "description",
+        "sub_label_score",
+        "average_estimated_speed",
+        "velocity_angle",
+        "path_data",
+        "recognized_license_plate",
+        "recognized_license_plate_score",
+    }
+
+    processed_events = [
+        {
+            "id": event.id,
+            "camera": event.camera,
+            "label": event.label,
+            "zones": event.zones,
+            "start_time": event.start_time,
+            "end_time": event.end_time,
+            "has_clip": event.has_clip,
+            "has_snapshot": event.has_snapshot,
+            "plus_id": event.plus_id,
+            "retain_indefinitely": event.retain_indefinitely,
+            "sub_label": event.sub_label,
+            "top_score": event.top_score,
+            "false_positive": event.false_positive,
+            "box": event.box,
+            "data": {
+                k: v for k, v in (event.data or {}).items() if k in allowed_data_keys
+            },
+            "event_count": event.event_count,
+        }
+        for event in query
+    ]
 
     return JSONResponse(content=processed_events)
 
@@ -487,22 +511,18 @@ async def event_ids(ids: str, request: Request):
             status_code=400,
         )
 
-    for event_id in ids:
-        try:
-            event = Event.get(Event.id == event_id)
-            await require_camera_access(event.camera, request=request)
-        except DoesNotExist:
-            # we should not fail the entire request if an event is not found
-            continue
-
     try:
-        events = Event.select().where(Event.id << ids).dicts().iterator()
+        events = list(Event.select().where(Event.id << ids).dicts().iterator())
-        return JSONResponse(list(events))
     except Exception:
         return JSONResponse(
             content=({"success": False, "message": "Events not found"}), status_code=400
         )
 
+    for event in events:
+        await require_camera_access(event["camera"], request=request)
+
+    return JSONResponse(events)
+
 
 @router.get(
     "/events/search",

frigate/api/preview.py

@@ -1,7 +1,9 @@
 """Preview apis."""
 
+import bisect
 import logging
 import os
+import threading
 from datetime import datetime, timedelta, timezone
 
 import pytz
@@ -133,6 +135,32 @@ def preview_hour(
     return preview_ts(camera_name, start_ts, end_ts, allowed_cameras)
 
 
+# cache one sorted listing of the shared preview_frames dir
+_preview_listing_lock = threading.Lock()
+_preview_listing_cache: tuple[float, list[str]] = (-1.0, [])
+
+
+def _get_preview_frame_listing(preview_dir: str) -> list[str]:
+    """Return the sorted preview_frames listing, cached until the dir changes."""
+    global _preview_listing_cache
+
+    # mtime bumps when a frame is added or removed, invalidating the cache
+    mtime = os.stat(preview_dir).st_mtime
+    cached_mtime, files = _preview_listing_cache
+    if mtime == cached_mtime:
+        return files
+
+    with _preview_listing_lock:
+        # another thread may have refreshed the cache while we waited
+        cached_mtime, files = _preview_listing_cache
+        if mtime == cached_mtime:
+            return files
+
+        files = sorted(entry.name for entry in os.scandir(preview_dir))
+        _preview_listing_cache = (mtime, files)
+        return files
+
+
 @router.get(
     "/preview/{camera_name}/start/{start_ts}/end/{end_ts}/frames",
     response_model=PreviewFramesResponse,
@@ -149,23 +177,15 @@ def get_preview_frames_from_cache(camera_name: str, start_ts: float, end_ts: flo
     start_file = f"{file_start}{start_ts}.{PREVIEW_FRAME_TYPE}"
     end_file = f"{file_start}{end_ts}.{PREVIEW_FRAME_TYPE}"
 
-    camera_files = [
+    files = _get_preview_frame_listing(preview_dir)
-        entry.name
+
-        for entry in os.scandir(preview_dir)
+    # a camera's frames form a contiguous slice of the sorted listing;
-        if entry.name.startswith(file_start)
+    # bisect locates it without scanning the whole directory
+    left = bisect.bisect_left(files, start_file)
+    right = bisect.bisect_right(files, end_file)
+    selected_previews = [
+        file for file in files[left:right] if file.startswith(file_start)
     ]
-    camera_files.sort()
-
-    selected_previews = []
-
-    for file in camera_files:
-        if file < start_file:
-            continue
-
-        if file > end_file:
-            break
-
-        selected_previews.append(file)
 
     return JSONResponse(
         content=selected_previews,

frigate/api/review.py

@@ -10,7 +10,7 @@ import pandas as pd
 from fastapi import APIRouter, Request
 from fastapi.params import Depends
 from fastapi.responses import JSONResponse
-from peewee import Case, DoesNotExist, IntegrityError, fn, operator
+from peewee import Case, DoesNotExist, fn, operator
 from playhouse.shortcuts import model_to_dict
 
 from frigate.api.auth import (
@@ -172,11 +172,19 @@ async def review_ids(request: Request, ids: str):
             status_code=400,
         )
 
+    try:
+        reviews = list(
+            ReviewSegment.select().where(ReviewSegment.id << ids).dicts().iterator()
+        )
+    except Exception:
+        return JSONResponse(
+            content=({"success": False, "message": "Review segments not found"}),
+            status_code=400,
+        )
+
+    found_ids = {r["id"] for r in reviews}
     for review_id in ids:
-        try:
+        if review_id not in found_ids:
-            review = ReviewSegment.get(ReviewSegment.id == review_id)
-            await require_camera_access(review.camera, request=request)
-        except DoesNotExist:
             return JSONResponse(
                 content=(
                     {"success": False, "message": f"Review {review_id} not found"}
@@ -184,16 +192,10 @@ async def review_ids(request: Request, ids: str):
                 status_code=404,
             )
 
-    try:
+    for review in reviews:
-        reviews = (
+        await require_camera_access(review["camera"], request=request)
-            ReviewSegment.select().where(ReviewSegment.id << ids).dicts().iterator()
+
-        )
+    return JSONResponse(reviews)
-        return JSONResponse(list(reviews))
-    except Exception:
-        return JSONResponse(
-            content=({"success": False, "message": "Review segments not found"}),
-            status_code=400,
-        )
 
 
 @router.get(
@@ -490,27 +492,52 @@ async def set_multiple_reviewed(
 
     user_id = current_user["username"]
 
-    for review_id in body.ids:
+    reviews = list(
-        try:
+        ReviewSegment.select(ReviewSegment.id, ReviewSegment.camera).where(
-            review = ReviewSegment.get(ReviewSegment.id == review_id)
+            ReviewSegment.id << body.ids
-            await require_camera_access(review.camera, request=request)
+        )
-            review_status = UserReviewStatus.get(
+    )
-                UserReviewStatus.user_id == user_id,
+
-                UserReviewStatus.review_segment == review_id,
+    for review in reviews:
+        await require_camera_access(review.camera, request=request)
+
+    found_ids = [r.id for r in reviews]
+
+    if found_ids:
+        existing_statuses = list(
+            UserReviewStatus.select().where(
+                (UserReviewStatus.user_id == user_id)
+                & (UserReviewStatus.review_segment << found_ids)
             )
-            # Update based on the reviewed parameter
+        )
-            if review_status.has_been_reviewed != body.reviewed:
+
-                review_status.has_been_reviewed = body.reviewed
+        status_by_review = {s.review_segment_id: s for s in existing_statuses}
-                review_status.save()
+
-        except DoesNotExist:
+        to_update = []
-            try:
+        to_create = []
-                UserReviewStatus.create(
+
-                    user_id=user_id,
+        for review_id in found_ids:
-                    review_segment=ReviewSegment.get(id=review_id),
+            if review_id in status_by_review:
-                    has_been_reviewed=body.reviewed,
+                status = status_by_review[review_id]
+                if status.has_been_reviewed != body.reviewed:
+                    status.has_been_reviewed = body.reviewed
+                    to_update.append(status)
+            else:
+                to_create.append(
+                    {
+                        "user_id": user_id,
+                        "review_segment_id": review_id,
+                        "has_been_reviewed": body.reviewed,
+                    }
                 )
-            except (DoesNotExist, IntegrityError):
+
-                pass
+        if to_update:
+            UserReviewStatus.bulk_update(
+                to_update, fields=[UserReviewStatus.has_been_reviewed], batch_size=100
+            )
+
+        if to_create:
+            UserReviewStatus.insert_many(to_create).execute()
 
     return JSONResponse(
         content=(

frigate/test/test_builtin.py

@@ -0,0 +1,41 @@
+"""Tests for frigate.util.builtin helpers."""
+
+import unittest
+from unittest.mock import patch
+
+from frigate.util.builtin import EventsPerSecond
+
+
+class TestEventsPerSecond(unittest.TestCase):
+    def test_eps_is_zero_before_any_events(self) -> None:
+        eps = EventsPerSecond()
+        with patch("frigate.util.builtin.time.monotonic", return_value=100.0):
+            self.assertEqual(eps.eps(), 0.0)
+
+    def test_eps_counts_events_in_window(self) -> None:
+        eps = EventsPerSecond(last_n_seconds=10)
+        clock = [1000.0]
+        with patch("frigate.util.builtin.time.monotonic", side_effect=lambda: clock[0]):
+            eps.start()
+            # one event per second for five seconds
+            for _ in range(5):
+                clock[0] += 1.0
+                eps.update()
+            # five events over the five seconds since start
+            self.assertAlmostEqual(eps.eps(), 1.0)
+
+    def test_old_timestamps_expire_from_window(self) -> None:
+        eps = EventsPerSecond(last_n_seconds=10)
+        clock = [0.0]
+        with patch("frigate.util.builtin.time.monotonic", side_effect=lambda: clock[0]):
+            eps.start()
+            for _ in range(10):
+                clock[0] += 1.0
+                eps.update()
+            # jump well past the window so every timestamp ages out
+            clock[0] += 100.0
+            self.assertEqual(eps.eps(), 0.0)
+
+
+if __name__ == "__main__":
+    unittest.main()

frigate/util/builtin.py

@@ -2,7 +2,6 @@
 
 import ast
 import copy
-import datetime
 import logging
 import math
 import multiprocessing.queues
@@ -10,7 +9,9 @@ import queue
 import re
 import shlex
 import struct
+import time
 import urllib.parse
+from collections import deque
 from collections.abc import Mapping
 from multiprocessing.managers import ValueProxy
 from pathlib import Path
@@ -32,23 +33,20 @@ class EventsPerSecond:
         self._start = None
         self._max_events = max_events
         self._last_n_seconds = last_n_seconds
-        self._timestamps = []
+        self._timestamps: deque[float] = deque(maxlen=max_events)
 
     def start(self) -> None:
-        self._start = datetime.datetime.now().timestamp()
+        self._start = time.monotonic()
 
     def update(self) -> None:
-        now = datetime.datetime.now().timestamp()
+        now = time.monotonic()
         if self._start is None:
             self._start = now
         self._timestamps.append(now)
-        # truncate the list when it goes 100 over the max_size
-        if len(self._timestamps) > self._max_events + 100:
-            self._timestamps = self._timestamps[(1 - self._max_events) :]
         self.expire_timestamps(now)
 
     def eps(self) -> float:
-        now = datetime.datetime.now().timestamp()
+        now = time.monotonic()
         if self._start is None:
             self._start = now
         # compute the (approximate) events in the last n seconds
@@ -63,7 +61,7 @@ class EventsPerSecond:
     def expire_timestamps(self, now: float) -> None:
         threshold = now - self._last_n_seconds
         while self._timestamps and self._timestamps[0] < threshold:
-            del self._timestamps[0]
+            self._timestamps.popleft()
 
 
 class InferenceSpeed:

migrations/036_add_perf_indexes.py

@@ -0,0 +1,27 @@
+"""Peewee migrations -- 036_add_perf_indexes.py.
+
+Adds composite/single-column indexes to speed up the most common queries
+issued by the web UI on initial page load:
+
+- event(camera, start_time DESC): /events list filtered by camera + time range
+- reviewsegment(camera, start_time DESC): /api/review filtered by camera + time range
+- reviewsegment(end_time): supports the end_time > after half of /api/review's range
+
+The existing event(label, start_time DESC) index from migration 027 already
+covers /events/explore, so it is intentionally not duplicated here.
+"""
+
+import peewee as pw
+
+SQL = pw.SQL
+
+
+def migrate(migrator, database, fake=False, **kwargs):
+    migrator.sql(
+        'CREATE INDEX IF NOT EXISTS "event_camera_start_time" '
+        'ON "event" ("camera", "start_time" DESC)'
+    )
+
+
+def rollback(migrator, database, fake=False, **kwargs):
+    migrator.sql('DROP INDEX IF EXISTS "event_camera_start_time"')