Add time-window based recording retention

Adds ability to filter recordings by time windows after a configurable
retention period. Useful for reducing storage while keeping recordings
during relevant times (e.g., business hours).

New config options under record.motion (and record.continuous):
- days: maximum retention in days (null for unlimited, 0 for none)
- hours: list of time windows like "mon-fri 07:00-18:00"
- always_retain: hours to keep all recordings before filtering (default 24)

Recordings associated with alerts/detections are always retained
regardless of time windows.

docs/docs/configuration/record.md

@@ -95,6 +95,29 @@ record:
 
 Continuous recording supports different retention modes [which are described below](#what-do-the-different-retain-modes-mean)
 
+### Time-Window Based Retention
+
+Recordings can be filtered to only retain footage from specific time windows after an initial period.
+
+```yaml
+record:
+  enabled: True
+  motion:
+    days: 14
+    always_retain: 48
+    hours:
+      - "mon-fri 07:00-23:00"
+      - "sat-sun 10:00-18:00"
+```
+
+Supported formats for `hours`:
+- `"07:00-23:00"` - all days
+- `"mon-fri 07:00-18:00"` - day range
+- `"sat 10:00-16:00"` - single day
+- `"22:00-06:00"` - overnight
+
+Alerts and detections are always retained regardless of time windows.
+
 ### Object Recording
 
 The number of days to record review items can be specified for review items classified as alerts as well as tracked objects.
@@ -116,7 +139,9 @@ This configuration will retain recording segments that overlap with alerts and d
 
 ## Can I have "continuous" recordings, but only at certain times?
 
-Using Frigate UI, Home Assistant, or MQTT, cameras can be automated to only record in certain situations or at certain times.
+Yes! You can use time-window based retention to keep recordings only from specific hours. See [Time-Window Based Retention](#time-window-based-retention) above.
+
+Alternatively, using Frigate UI, Home Assistant, or MQTT, cameras can be automated to only record in certain situations or at certain times.
 
 ## How do I export recordings?
 

docs/docs/configuration/reference.md

@@ -517,13 +517,31 @@ record:
     # Optional: Number of days to retain recordings regardless of tracked objects or motion (default: shown below)
     # NOTE: This should be set to 0 and retention should be defined in alerts and detections section below
     #       if you only want to retain recordings of alerts and detections.
+    #       Set to null for unlimited retention.
     days: 0
+    # Optional: Time windows to retain recordings (default: not set, keep all times)
+    # After always_retain period, only recordings within these windows are kept.
+    # Format: "HH:MM-HH:MM" or "mon-fri HH:MM-HH:MM" or "sat HH:MM-HH:MM"
+    hours:
+      - "mon-fri 07:00-23:00"
+      - "sat-sun 10:00-18:00"
+    # Optional: Hours to retain all recordings before applying time window filter (default: shown below)
+    always_retain: 24
   # Optional: Motion retention settings
   motion:
     # Optional: Number of days to retain recordings regardless of tracked objects (default: shown below)
     # NOTE: This should be set to 0 and retention should be defined in alerts and detections section below
     #       if you only want to retain recordings of alerts and detections.
+    #       Set to null for unlimited retention.
     days: 0
+    # Optional: Time windows to retain recordings (default: not set, keep all times)
+    # After always_retain period, only recordings within these windows are kept.
+    # Format: "HH:MM-HH:MM" or "mon-fri HH:MM-HH:MM" or "sat HH:MM-HH:MM"
+    hours:
+      - "mon-fri 07:00-23:00"
+      - "sat-sun 10:00-18:00"
+    # Optional: Hours to retain all recordings before applying time window filter (default: shown below)
+    always_retain: 24
   # Optional: Recording Export Settings
   export:
     # Optional: Timelapse Output Args (default: shown below).

frigate/config/camera/record.py

@@ -1,7 +1,8 @@
+import re
 from enum import Enum
 from typing import Optional
 
-from pydantic import Field
+from pydantic import Field, field_validator
 
 from frigate.const import MAX_PRE_CAPTURE
 from frigate.review.types import SeverityEnum
@@ -21,9 +22,117 @@ __all__ = [
 
 DEFAULT_TIME_LAPSE_FFMPEG_ARGS = "-vf setpts=0.04*PTS -r 30"
 
+WEEKDAY_MAP = {
+    "mon": 0,
+    "monday": 0,
+    "tue": 1,
+    "tuesday": 1,
+    "wed": 2,
+    "wednesday": 2,
+    "thu": 3,
+    "thursday": 3,
+    "fri": 4,
+    "friday": 4,
+    "sat": 5,
+    "saturday": 5,
+    "sun": 6,
+    "sunday": 6,
+}
+
+TIME_WINDOW_PATTERN = re.compile(
+    r"^(?:([a-z]+)(?:-([a-z]+))?\s+)?(\d{2}):(\d{2})-(\d{2}):(\d{2})$", re.IGNORECASE
+)
+
+
+def _parse_time_window(entry: str) -> dict:
+    """Parse time window string into components."""
+    match = TIME_WINDOW_PATTERN.match(entry.strip())
+    if not match:
+        raise ValueError(
+            f"Invalid time window format: '{entry}'. "
+            "Use 'HH:MM-HH:MM' or 'mon-fri HH:MM-HH:MM'"
+        )
+
+    day_start, day_end, start_h, start_m, end_h, end_m = match.groups()
+
+    weekdays = None
+    if day_start:
+        start_day = day_start.lower()
+        if start_day not in WEEKDAY_MAP:
+            raise ValueError(f"Invalid weekday: '{day_start}'")
+        start_num = WEEKDAY_MAP[start_day]
+
+        if day_end:
+            end_day = day_end.lower()
+            if end_day not in WEEKDAY_MAP:
+                raise ValueError(f"Invalid weekday: '{day_end}'")
+            end_num = WEEKDAY_MAP[end_day]
+            if start_num <= end_num:
+                weekdays = list(range(start_num, end_num + 1))
+            else:
+                weekdays = list(range(start_num, 7)) + list(range(0, end_num + 1))
+        else:
+            weekdays = [start_num]
+
+    return {
+        "weekdays": weekdays,
+        "start": int(start_h) * 60 + int(start_m),
+        "end": int(end_h) * 60 + int(end_m),
+    }
+
+
+def _matches_time_window(
+    windows: list[dict], weekday: int, hour: int, minute: int
+) -> bool:
+    """Check if given time falls within any time window."""
+    time_val = hour * 60 + minute
+    for window in windows:
+        if window["weekdays"] is not None and weekday not in window["weekdays"]:
+            continue
+        start, end = window["start"], window["end"]
+        if start <= end:
+            if start <= time_val <= end:
+                return True
+        else:
+            # overnight range like 22:00-06:00
+            if time_val >= start or time_val <= end:
+                return True
+    return False
+
 
 class RecordRetainConfig(FrigateBaseModel):
-    days: float = Field(default=0, ge=0, title="Default retention period.")
+    days: Optional[float] = Field(
+        default=None,
+        ge=0,
+        title="Maximum retention period in days. None for unlimited, 0 for no retention.",
+    )
+    hours: Optional[list[str]] = Field(
+        default=None,
+        title="Time windows to retain recordings. Outside these windows, recordings are deleted after always_retain period.",
+    )
+    always_retain: float = Field(
+        default=24,
+        ge=0,
+        title="Hours to keep all recordings before applying time window filter.",
+    )
+
+    @field_validator("hours", mode="before")
+    @classmethod
+    def validate_hours(cls, v):
+        if v is None:
+            return None
+        if not isinstance(v, list):
+            raise ValueError("hours must be a list")
+        for entry in v:
+            _parse_time_window(entry)
+        return v
+
+    def is_in_retention_window(self, weekday: int, hour: int, minute: int = 0) -> bool:
+        """Check if recordings at this time should be retained."""
+        if not self.hours:
+            return True
+        windows = [_parse_time_window(s) for s in self.hours]
+        return _matches_time_window(windows, weekday, hour, minute)
 
 
 class RetainModeEnum(str, Enum):

frigate/record/cleanup.py

@@ -7,6 +7,7 @@ import os
 import threading
 from multiprocessing.synchronize import Event as MpEvent
 from pathlib import Path
+from typing import Optional
 
 from playhouse.sqlite_ext import SqliteExtDatabase
 
@@ -104,13 +105,28 @@ class RecordingCleanup(threading.Thread):
         self,
         continuous_expire_date: float,
         motion_expire_date: float,
+        window_expire_date: Optional[float],
         config: CameraConfig,
         reviews: ReviewSegment,
     ) -> None:
         """Delete recordings for existing camera based on retention config."""
-        # Get the timestamp for cutoff of retained days
+        # Build query condition for recordings to check
+        expire_condition = (Recordings.camera == config.name) & (
+            (
+                (Recordings.end_time < continuous_expire_date)
+                & (Recordings.motion == 0)
+                & (Recordings.dBFS == 0)
+            )
+            | (Recordings.end_time < motion_expire_date)
+        )
+
+        # Include recordings past time-window cutoff for filtering
+        if window_expire_date is not None:
+            expire_condition = expire_condition | (
+                (Recordings.camera == config.name)
+                & (Recordings.end_time < window_expire_date)
+            )
 
-        # Get recordings to check for expiration
         recordings: Recordings = (
             Recordings.select(
                 Recordings.id,
@@ -121,17 +137,7 @@ class RecordingCleanup(threading.Thread):
                 Recordings.motion,
                 Recordings.dBFS,
             )
-            .where(
-                (Recordings.camera == config.name)
-                & (
-                    (
-                        (Recordings.end_time < continuous_expire_date)
-                        & (Recordings.motion == 0)
-                        & (Recordings.dBFS == 0)
-                    )
-                    | (Recordings.end_time < motion_expire_date)
-                )
-            )
+            .where(expire_condition)
             .order_by(Recordings.start_time)
             .namedtuples()
             .iterator()
@@ -180,16 +186,35 @@ class RecordingCleanup(threading.Thread):
                 if review.end_time + post_capture < recording.start_time:
                     review_start = idx
 
+            # Check time-window retention for recordings without review overlap
+            within_window = False
+            motion_config = config.record.motion
+            if motion_config.hours and not keep:
+                recording_dt = datetime.datetime.fromtimestamp(recording.start_time)
+                now = datetime.datetime.now()
+                age_hours = (now - recording_dt).total_seconds() / 3600
+                if age_hours <= motion_config.always_retain:
+                    within_window = True
+                elif motion_config.is_in_retention_window(
+                    recording_dt.weekday(), recording_dt.hour, recording_dt.minute
+                ):
+                    within_window = True
+
             # Delete recordings outside of the retention window or based on the retention mode
             if (
-                not keep
+                (not keep and not within_window)
                 or (
-                    mode == RetainModeEnum.motion
+                    keep
+                    and mode == RetainModeEnum.motion
                     and recording.motion == 0
                     and recording.objects == 0
                     and recording.dBFS == 0
                 )
-                or (mode == RetainModeEnum.active_objects and recording.objects == 0)
+                or (
+                    keep
+                    and mode == RetainModeEnum.active_objects
+                    and recording.objects == 0
+                )
             ):
                 Path(recording.path).unlink(missing_ok=True)
                 deleted_recordings.add(recording.id)
@@ -271,10 +296,13 @@ class RecordingCleanup(threading.Thread):
         logger.debug("Start expire recordings.")
         logger.debug("Start deleted cameras.")
 
-        # Handle deleted cameras
-        expire_days = max(
-            self.config.record.continuous.days, self.config.record.motion.days
-        )
+        # Handle deleted cameras - use configured days or skip if unlimited
+        continuous_days = self.config.record.continuous.days
+        motion_days = self.config.record.motion.days
+        if continuous_days is None and motion_days is None:
+            expire_days = 0  # no day-based expiration configured
+        else:
+            expire_days = max(continuous_days or 0, motion_days or 0)
         expire_before = (
             datetime.datetime.now() - datetime.timedelta(days=expire_days)
         ).timestamp()
@@ -312,16 +340,32 @@ class RecordingCleanup(threading.Thread):
             now = datetime.datetime.now()
 
             self.expire_review_segments(config, now)
+
+            # Calculate expire dates - None means unlimited (use far future)
+            continuous_days = config.record.continuous.days
+            motion_days = config.record.motion.days
             continuous_expire_date = (
-                now - datetime.timedelta(days=config.record.continuous.days)
+                now
+                - datetime.timedelta(
+                    days=continuous_days if continuous_days is not None else 36500
+                )
             ).timestamp()
             motion_expire_date = (
                 now
                 - datetime.timedelta(
                     days=max(
-                        config.record.motion.days, config.record.continuous.days
-                    )  # can't keep motion for less than continuous
+                        motion_days if motion_days is not None else 36500,
+                        continuous_days if continuous_days is not None else 0,
                     )
+                )
+            ).timestamp()
+
+            # Calculate time-window cutoff if configured
+            motion_config = config.record.motion
+            window_expire_date = None
+            if motion_config.hours:
+                window_expire_date = (
+                    now - datetime.timedelta(hours=motion_config.always_retain)
                 ).timestamp()
 
             # Get all the reviews to check against
@@ -342,7 +386,11 @@ class RecordingCleanup(threading.Thread):
             )
 
             self.expire_existing_camera_recordings(
-                continuous_expire_date, motion_expire_date, config, reviews
+                continuous_expire_date,
+                motion_expire_date,
+                window_expire_date,
+                config,
+                reviews,
             )
             logger.debug(f"End camera: {camera}.")
 

frigate/test/test_time_window_retention.py

@@ -0,0 +1,86 @@
+import unittest
+
+from frigate.config.camera.record import (
+    RecordRetainConfig,
+    _matches_time_window,
+    _parse_time_window,
+)
+
+
+class TestTimeWindowParsing(unittest.TestCase):
+    def test_parse_time_only(self):
+        result = _parse_time_window("07:00-18:00")
+        self.assertIsNone(result["weekdays"])
+        self.assertEqual(result["start"], 7 * 60)
+        self.assertEqual(result["end"], 18 * 60)
+
+    def test_parse_single_day(self):
+        result = _parse_time_window("mon 09:00-17:00")
+        self.assertEqual(result["weekdays"], [0])
+        self.assertEqual(result["start"], 9 * 60)
+        self.assertEqual(result["end"], 17 * 60)
+
+    def test_parse_day_range(self):
+        result = _parse_time_window("mon-fri 07:00-23:00")
+        self.assertEqual(result["weekdays"], [0, 1, 2, 3, 4])
+
+    def test_parse_day_range_wrap(self):
+        result = _parse_time_window("fri-mon 10:00-16:00")
+        self.assertEqual(result["weekdays"], [4, 5, 6, 0])
+
+    def test_parse_full_day_names(self):
+        result = _parse_time_window("monday-friday 08:00-18:00")
+        self.assertEqual(result["weekdays"], [0, 1, 2, 3, 4])
+
+    def test_parse_invalid_format(self):
+        with self.assertRaises(ValueError):
+            _parse_time_window("invalid")
+
+    def test_parse_invalid_weekday(self):
+        with self.assertRaises(ValueError):
+            _parse_time_window("xyz 10:00-12:00")
+
+
+class TestTimeWindowMatching(unittest.TestCase):
+    def test_match_all_days(self):
+        windows = [_parse_time_window("07:00-23:00")]
+        self.assertTrue(_matches_time_window(windows, 0, 12, 0))
+        self.assertTrue(_matches_time_window(windows, 6, 12, 0))
+        self.assertFalse(_matches_time_window(windows, 0, 3, 0))
+
+    def test_match_weekday_range(self):
+        windows = [_parse_time_window("mon-fri 09:00-17:00")]
+        self.assertTrue(_matches_time_window(windows, 2, 12, 0))
+        self.assertFalse(_matches_time_window(windows, 5, 12, 0))
+        self.assertFalse(_matches_time_window(windows, 2, 8, 0))
+
+    def test_match_overnight(self):
+        windows = [_parse_time_window("22:00-06:00")]
+        self.assertTrue(_matches_time_window(windows, 0, 23, 0))
+        self.assertTrue(_matches_time_window(windows, 0, 3, 0))
+        self.assertFalse(_matches_time_window(windows, 0, 12, 0))
+
+    def test_match_multiple_windows(self):
+        windows = [
+            _parse_time_window("mon-fri 07:00-18:00"),
+            _parse_time_window("sat-sun 10:00-16:00"),
+        ]
+        self.assertTrue(_matches_time_window(windows, 0, 12, 0))
+        self.assertTrue(_matches_time_window(windows, 5, 12, 0))
+        self.assertFalse(_matches_time_window(windows, 5, 8, 0))
+
+
+class TestRecordRetainConfig(unittest.TestCase):
+    def test_no_hours_always_retained(self):
+        config = RecordRetainConfig()
+        self.assertTrue(config.is_in_retention_window(0, 3, 0))
+
+    def test_hours_filters_correctly(self):
+        config = RecordRetainConfig(hours=["mon-fri 09:00-17:00"])
+        self.assertTrue(config.is_in_retention_window(0, 12, 0))
+        self.assertFalse(config.is_in_retention_window(0, 20, 0))
+
+    def test_defaults(self):
+        config = RecordRetainConfig()
+        self.assertIsNone(config.days)
+        self.assertEqual(config.always_retain, 24)