watched: single DONE_RATIO source constant replaces the seven hardcoded 0.95 literals

server/app.py DONE_RATIO is injected into index.html like {{VERSION}}, app.js
reads it as window.DONE_RATIO (fallback = same default). Change the threshold
in exactly one place now.

server/app.py

@@ -44,6 +44,11 @@ def _version():
 
 VERSION = _version()
 
+# An episode counts as "watched" once you're this far through it (fraction of
+# duration). One knob for client + server: injected into index.html below so
+# app.js uses the same value as these stats. Change here only.
+DONE_RATIO = 0.95
+
 # latest probe result + last 20 samples (~1h at 3-min spacing), for GET /api/cdn
 _CDN = {"state": "unknown", "kbps": 0.0, "ts": 0.0, "hist": []}
 # origin (primary provider pages/API) health — separate host, separate failure
@@ -455,7 +460,7 @@ def api_stats(request: Request, days: int = Query(30, ge=1, le=365),
         if s["last_ts"] > a["last_seen"]:
             a["last_seen"] = s["last_ts"]
             a["cur_ep"] = s["last_ep"]
-        if s["dur"] > 0 and s["max"] >= s["dur"] * 0.95:
+        if s["dur"] > 0 and s["max"] >= s["dur"] * DONE_RATIO:
             a["completed"] += 1
             completed += 1
     now = time.time()
@@ -700,8 +705,10 @@ def stream(token: str):
 @app.get("/index.html", include_in_schema=False)
 def index():
     # index.html is served (not mounted) so ?v={{VERSION}} becomes the git
-    # SHA at startup; other statics go through the mount below
-    return HTMLResponse(_INDEX_HTML.replace("{{VERSION}}", VERSION))
+    # SHA and {{DONE_RATIO}} the watched threshold at startup; other statics
+    # go through the mount below
+    return HTMLResponse(_INDEX_HTML.replace("{{VERSION}}", VERSION)
+                        .replace("{{DONE_RATIO}}", repr(DONE_RATIO)))
 
 
 _INDEX_HTML = (ROOT / "static" / "index.html").read_text()

static/app.js

@@ -10,6 +10,9 @@ const BASE = (() => {
   return p.endsWith("/") ? p : p.slice(0, p.lastIndexOf("/") + 1);
 })();
 const main = document.getElementById("main");
+// Watched threshold (fraction of duration) — injected inline by the server
+// from DONE_RATIO in server/app.py; fallback matches that default.
+const DONE_RATIO = Number(window.DONE_RATIO ?? 0.95);
 let hls = null, detail = null, lang = "jpn", seasonId = null;
 
 async function api(path) {
@@ -190,7 +193,7 @@ const homeCard = x => {
   c.append(poster(x.poster, x.title));
   let meta = `E${x.ep} \u00b7 ${x.lang === "eng" ? "dub" : "sub"}`;
   if (done) meta += " \u00b7 \u2713";
-  else if (x.dur > 0 && x.pos < x.dur * 0.95) meta += ` \u00b7 ${fmtMin((x.dur - x.pos) / 60)} left`;
+  else if (x.dur > 0 && x.pos < x.dur * DONE_RATIO) meta += ` \u00b7 ${fmtMin((x.dur - x.pos) / 60)} left`;
   else if (hold) meta += ` \u00b7 ${Math.round(Date.now() / 1000 / 86400 - x.t / 86400)}d ago`;
   const info = el("div", "mini-info");
   info.append(el("div", "card-name", x.title), el("div", "mini-meta", meta));
@@ -250,11 +253,11 @@ function showHome() {
   body.append(el("div", "hero-kicker", "continue watching"),
               el("h2", null, hero.title),
               el("div", "muted", `Ep ${hero.ep} · ${hero.lang === "eng" ? "dub" : "sub"} · ${fmtPos(hero.pos)} in` +
-                (hero.dur > 0 && hero.pos < hero.dur * 0.95 ? ` · ${fmtMin((hero.dur - hero.pos) / 60)} left` : "") +
+                (hero.dur > 0 && hero.pos < hero.dur * DONE_RATIO ? ` · ${fmtMin((hero.dur - hero.pos) / 60)} left` : "") +
                 ` · ${timeago(hero.t)}`));
   const p = bar(hero);
   if (p) body.append(p);
-  const heroDone = hero.dur > 0 && hero.pos >= hero.dur * 0.95;
+  const heroDone = hero.dur > 0 && hero.pos >= hero.dur * DONE_RATIO;
   const go = el("button", "btn resume", heroDone ? "\u25b6 Next ep" : "\u25b6 Resume");
   go.onclick = () => location.href = histHref(hero);
   right.append(body, go);
@@ -503,7 +506,7 @@ async function showAnime(slug_id, opts = {}) {
     for (const x of await api("/api/history?all=1")) {
       if (x.slug_id !== slug_id || x.season_id !== seasonId) continue;
       started = true;
-      if (x.dur > 0 && x.pos >= x.dur * 0.95) watchDone.add(String(x.ep_id));
+      if (x.dur > 0 && x.pos >= x.dur * DONE_RATIO) watchDone.add(String(x.ep_id));
       else if (x.dur > 0) epProg.set(String(x.ep_id), Math.min(100, Math.round(100 * x.pos / x.dur)));
     }
   } catch {}
@@ -529,7 +532,7 @@ async function showAnime(slug_id, opts = {}) {
 function langLabel() { return lang === "eng" ? "▶ dub" : "▶ sub"; }
 
 // ---------- history page (full list + delete + client-side filter) ----------
-const histClass = x => x.dur > 0 && x.pos >= x.dur * 0.95 ? "done"
+const histClass = x => x.dur > 0 && x.pos >= x.dur * DONE_RATIO ? "done"
   : (x.t && Date.now() / 1000 - x.t > 7 * 86400 ? "hold" : "watching");
 function remapBoard() {
   // home: one stale card per stale anime (latest row), above the hero, so a
@@ -1215,7 +1218,7 @@ async function play(ep_id, ep_no) {
     }
     if (saved?.pos > 10) {
       v.addEventListener("loadedmetadata", () => {
-        if (saved.pos < v.duration * 0.95) v.currentTime = saved.pos;
+        if (saved.pos < v.duration * DONE_RATIO) v.currentTime = saved.pos;
       }, {once: true});
     }
     v.onerror = () => playerFail("media error");

static/index.html

@@ -35,6 +35,9 @@
      route) with the git SHA at startup — a correct cache key per commit.
      No hand-bumping; JSV in app.js reads the same value from its own URL. -->
 <script src="hls.min.js"></script>
+<!-- Watched threshold: server injects its DONE_RATIO source constant here;
+     app.js reads it as DONE_RATIO. Server uses the same value for its stats. -->
+<script>window.DONE_RATIO = {{DONE_RATIO}};</script>
 <script src="app.js?v={{VERSION}}"></script>
 </body>
 </html>