Server: stop the photo from advancing during quiet hours too

Quiet hours only clamped what refresh_interval_s the *device* is told
to sleep for -- the separate elapsed-time check in
photo_queue.get_current() (used by /frame/image, /frame/photo-info,
/frame/face-labels, and /api/queue) had no quiet-hours awareness at
all, since it runs independent of the device. An open web UI tab
polling /api/queue overnight, or just loading the page during a quiet
window, would silently advance which photo is "current" on raw elapsed
time alone -- nothing reaches the panel until the device wakes after
quiet hours end, but the pointer moving mid-window still isn't what
"don't do anything overnight" implies.

get_current() now takes an in_quiet_hours flag that suppresses only the
elapsed-time trigger; an unset/invalid current photo is still picked
regardless (showing nothing is worse than showing something even at
3am). New _in_quiet_hours() helper in main.py, passed at all four call
sites.

server/app/main.py

@@ -129,6 +129,21 @@ def _effective_refresh_interval_s(cfg: config.FrameConfig) -> int:
     return min(cfg.refresh_interval_s, seconds_to_boundary)
 
 
+def _in_quiet_hours(cfg: config.FrameConfig) -> bool:
+    """Whether quiet hours are in effect right now -- separate from
+    _effective_refresh_interval_s, which only shapes what the *device* is
+    told to sleep for. This instead gates photo_queue.get_current()'s
+    time-based advance, since that check runs independent of the device
+    (also triggered by the web UI's /api/queue, e.g. an open browser tab
+    polling overnight) and would otherwise happily advance the current
+    photo mid-quiet-hours on raw elapsed time alone."""
+    if not cfg.quiet_hours_enabled:
+        return False
+    now = datetime.now(_zoneinfo(cfg.timezone))
+    in_quiet, _ = _quiet_hours_state(now, cfg.quiet_hours_start, cfg.quiet_hours_end)
+    return in_quiet
+
+
 def _max_expected_gap_s(cfg: config.FrameConfig) -> int:
     """Longest gap between wakes the device might legitimately have --
     normally just refresh_interval_s, but quiet hours can make the real
@@ -350,7 +365,7 @@ def frame_image():
 
     with config.locked():
         cfg = config.load()  # re-read: state may have changed since the unlocked read above
-        if photo_queue.get_current(cfg, assets):
+        if photo_queue.get_current(cfg, assets, in_quiet_hours=_in_quiet_hours(cfg)):
             config.save(cfg)
 
     return Response(content=_render_asset(client, cfg, cfg.current_asset_id), media_type="application/octet-stream")
@@ -593,7 +608,7 @@ def frame_photo_info():
 
     with config.locked():
         cfg = config.load()  # re-read: state may have changed since the unlocked read above
-        if photo_queue.get_current(cfg, assets):
+        if photo_queue.get_current(cfg, assets, in_quiet_hours=_in_quiet_hours(cfg)):
             config.save(cfg)
 
     if not cfg.current_asset_id:
@@ -662,7 +677,7 @@ def frame_face_labels():
 
     with config.locked():
         cfg = config.load()  # re-read: state may have changed since the unlocked read above
-        if photo_queue.get_current(cfg, assets):
+        if photo_queue.get_current(cfg, assets, in_quiet_hours=_in_quiet_hours(cfg)):
             config.save(cfg)
 
     if not cfg.current_asset_id:
@@ -703,7 +718,7 @@ def api_queue():
 
     with config.locked():
         cfg = config.load()  # re-read: state may have changed since the unlocked read above
-        current_changed = photo_queue.get_current(cfg, assets)
+        current_changed = photo_queue.get_current(cfg, assets, in_quiet_hours=_in_quiet_hours(cfg))
         queue_before = list(cfg.queue)
         photo_queue.sync_queue_length(cfg, assets)
         if current_changed or cfg.queue != queue_before:

server/app/photo_queue.py

@@ -180,7 +180,7 @@ def sync_queue_length(cfg: FrameConfig, assets: list[dict]) -> None:
     _top_up(cfg, assets)
 
 
-def get_current(cfg: FrameConfig, assets: list[dict]) -> bool:
+def get_current(cfg: FrameConfig, assets: list[dict], in_quiet_hours: bool = False) -> bool:
     """Time-based, idempotent path used by GET /frame/image. Advances only
     if the current photo is unset/invalid or refresh_interval_s has
     elapsed since it was set. Returns whether it changed anything, so the
@@ -188,13 +188,20 @@ def get_current(cfg: FrameConfig, assets: list[dict]) -> bool:
     the interval is a no-op both times -- what makes an unplanned device
     reboot safe: it just re-reads the current photo instead of skipping
     ahead, while a wake that lands after the interval has elapsed still
-    advances exactly once, even after a long time offline."""
+    advances exactly once, even after a long time offline.
+
+    in_quiet_hours suppresses *only* the elapsed-time trigger -- an
+    unset/invalid current photo still gets picked regardless, since
+    showing nothing is worse than showing something even at 3am. This
+    check runs independent of the device (also triggered by the web UI's
+    /api/queue), so without this an open browser tab polling overnight
+    would silently advance the current photo on raw elapsed time alone,
+    even though the device itself is correctly asleep through the
+    window (see main.py's _effective_refresh_interval_s)."""
     valid_ids = {a["id"] for a in assets}
-    stale = (
-        not cfg.current_asset_id
-        or cfg.current_asset_id not in valid_ids
-        or (time.time() - cfg.current_asset_set_at) >= cfg.refresh_interval_s
-    )
+    needs_pick = not cfg.current_asset_id or cfg.current_asset_id not in valid_ids
+    time_elapsed = (time.time() - cfg.current_asset_set_at) >= cfg.refresh_interval_s
+    stale = needs_pick or (time_elapsed and not in_quiet_hours)
     if not stale:
         return False
     advance_forced(cfg, assets)