meeting words come from the units table; the constants are now defaults

MEETING_DAY, MEETING_DAYS, MEETING_DAY_ABBR, PACK_TIME, TROOP_TIME,
PACK_CLOCK and TROOP_CLOCK were the last thing a leader could not change
without a commit. identity.meeting_words() derives all seven from the units
rows; app.py refreshes the module globals from it on a 30-second TTL in a
middleware, and the page templates - f-strings that read those globals when a
route runs - are untouched. A row that cannot supply a word keeps the
default, so a half-filled unit degrades to today's copy rather than a blank.

The day words come from the pack row: the site's copy assumes both units
meet the same night, and if that changes the copy needs rewriting, not a
bigger constant. Proven on a throwaway container with a DB copy: patching
pack73 to Thursday 18:15 changed the homepage, cubs, troop and meta
description; patching back restored them. tests/smoke_identity.py 59 -> 66.

app/app.py

@@ -59,9 +59,47 @@ TROOP_TIME = "7:30 PM"
 PACK_CLOCK = "6:00"
 TROOP_CLOCK = "7:30"
 
+# Since 2026-09-04 the seven meeting words above are DEFAULTS. The live values
+# come from the units table (edited by leaders through the console, P2) via
+# identity.meeting_words(), applied by the middleware below before every
+# request. A unit row that cannot supply a word leaves the default standing,
+# so the constants are still the right place to read what the site falls back
+# to - and PROGRAM_YEAR stays a plain constant.
+_MEETING_DEFAULTS = dict(MEETING_DAY=MEETING_DAY, MEETING_DAYS=MEETING_DAYS,
+                         MEETING_DAY_ABBR=MEETING_DAY_ABBR, PACK_TIME=PACK_TIME,
+                         TROOP_TIME=TROOP_TIME, PACK_CLOCK=PACK_CLOCK, TROOP_CLOCK=TROOP_CLOCK)
+_meeting_cache = {"at": 0.0}
+MEETING_TTL = 30
+
+
+def refresh_meeting_words(force=False):
+    """Re-derive the meeting words from the units table, at most every
+    MEETING_TTL seconds. The page templates are f-strings that read these
+    module globals when a route runs, so updating the globals is the whole
+    wiring - no template changes. Any failure keeps the defaults."""
+    global MEETING_DAY, MEETING_DAYS, MEETING_DAY_ABBR, PACK_TIME, TROOP_TIME, PACK_CLOCK, TROOP_CLOCK
+    now = time.monotonic()
+    if not force and now - _meeting_cache["at"] < MEETING_TTL:
+        return
+    _meeting_cache["at"] = now
+    try:
+        w = identity.meeting_words(identity.list_units(), _MEETING_DEFAULTS)
+    except Exception as e:
+        print("meeting words: keeping defaults: %s" % e, flush=True)
+        return
+    MEETING_DAY, MEETING_DAYS, MEETING_DAY_ABBR = w["MEETING_DAY"], w["MEETING_DAYS"], w["MEETING_DAY_ABBR"]
+    PACK_TIME, TROOP_TIME = w["PACK_TIME"], w["TROOP_TIME"]
+    PACK_CLOCK, TROOP_CLOCK = w["PACK_CLOCK"], w["TROOP_CLOCK"]
+
 app = FastAPI(title="Pack & Troop 73")
 app.mount("/static", StaticFiles(directory="/app/static"), name="static")
 
+
+@app.middleware("http")
+async def _meeting_words_middleware(request, call_next):
+    refresh_meeting_words()
+    return await call_next(request)
+
 # Creates the schema if absent and backfills the legacy leads.jsonl once.
 store.init(backfill_jsonl=LEADS)
 app.include_router(admin_api.router)
@@ -1089,6 +1127,7 @@ def bootstrap_notify(url):
 
 
 identity.init()
+refresh_meeting_words(force=True)
 auth.PAGE = page
 app.include_router(auth.router)