feat(discover): full reset — clear + rebuild suggestions

POST /api/discover/reset sets discover.resetRequested; the worker, at the
start of the next sweep, clears all PENDING suggestions + contributions +
seed throttles and nulls WatchedArtist.lastDiscoveredAt (keeping
followed/wanted/dismissed decisions), then regenerates everything with current
logic. A 'Reset' button on /discover (2-step confirm) triggers it.

worker 247, web 190 tests.

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

web/src/app/api/discover/reset/route.test.ts

@@ -0,0 +1,17 @@
+import { describe, it, expect } from "vitest";
+import { prisma } from "@/lib/db";
+import { POST } from "./route";
+
+describe("POST /api/discover/reset", () => {
+  it("sets the reset + requested flags so the worker rebuilds on the next sweep", async () => {
+    const res = await POST();
+    expect(res.status).toBe(202);
+    expect((await res.json()).reset).toBe(true);
+    const cfg = Object.fromEntries(
+      (await prisma.config.findMany({ where: { key: { in: ["discover.resetRequested", "discover.requested"] } } }))
+        .map((c) => [c.key, c.value]),
+    );
+    expect(cfg["discover.resetRequested"]).toBe("true");
+    expect(cfg["discover.requested"]).toBe("true");
+  });
+});

web/src/app/api/discover/reset/route.ts

@@ -0,0 +1,17 @@
+import { prisma } from "@/lib/db";
+
+// POST /api/discover/reset — request a full rebuild: the worker clears the pending
+// suggestions, contributions, and seed throttles at the start of the next sweep, then
+// regenerates everything with the current logic. Kicks a sweep immediately.
+export async function POST() {
+  await Promise.all(
+    ["discover.resetRequested", "discover.requested"].map((key) =>
+      prisma.config.upsert({
+        where: { key },
+        create: { key, value: "true", secret: false },
+        update: { value: "true" },
+      }),
+    ),
+  );
+  return Response.json({ reset: true }, { status: 202 });
+}

web/src/app/discover/discover-client.tsx

@@ -69,6 +69,7 @@ export function DiscoverClient() {
   const [query, setQuery] = useState("");
   const [search, setSearch] = useState<SearchResult | null>(null);
   const [busy, setBusy] = useState(false);
+  const [confirmReset, setConfirmReset] = useState(false);
   const [followedSimilar, setFollowedSimilar] = useState<Set<string>>(new Set());
   const [albumModal, setAlbumModal] = useState<{ a: Album; artistName: string; artistMbid: string } | null>(null);
 
@@ -106,6 +107,18 @@ export function DiscoverClient() {
     setRunning(true);
   }
 
+  async function resetDiscover() {
+    setConfirmReset(false);
+    const res = await fetch("/api/discover/reset", { method: "POST" }).catch(() => null);
+    if (res && (res.ok || res.status === 202)) {
+      setRows([]); // clears immediately; the rebuild repopulates
+      setRunning(true);
+      toast("Rebuilding suggestions from scratch…");
+    } else {
+      toast("Couldn't reset");
+    }
+  }
+
   async function runSearch(e: React.FormEvent) {
     e.preventDefault();
     if (!query.trim()) return;
@@ -169,6 +182,17 @@ export function DiscoverClient() {
         <button className="btn accent" onClick={discoverNow} disabled={running}>
           {running ? "Discovering…" : "Discover now"}
         </button>
+        {confirmReset ? (
+          <>
+            <span className="rmeta">Clear all suggestions and rebuild from scratch?</span>
+            <button className="btn sm accent" onClick={resetDiscover}>Reset</button>
+            <button className="btn sm ghost" onClick={() => setConfirmReset(false)}>Cancel</button>
+          </>
+        ) : (
+          <>
+            <button className="btn sm ghost" onClick={() => setConfirmReset(true)} disabled={running}>
+              Reset
+            </button>
             <span className="rmeta">
               {running
                 ? "Sweeping your followed artists for new suggestions…"
@@ -176,6 +200,8 @@ export function DiscoverClient() {
                   ? `Last discovered ${agoLabel(lastRunAt)}${result ? ` · ${result}` : ""}`
                   : "Not yet run — press Discover now to sweep your followed artists"}
             </span>
+          </>
+        )}
       </div>
 
       <SectionHeader title="Find similar" />

worker/lyra_worker/discovery.py

@@ -315,6 +315,18 @@ def _recompute_suggestions(conn: psycopg.Connection, affected: set[str],
     return surfaced
 
 
+def reset_pending(conn: psycopg.Connection) -> None:
+    """Clear discovery state so the next sweep rebuilds from scratch with current logic. Drops
+    all PENDING suggestions (followed/wanted/dismissed user decisions are kept), every seed
+    contribution + library-seed throttle, and marks each watched artist due again."""
+    with conn.cursor() as cur:
+        cur.execute("DELETE FROM \"DiscoverySuggestion\" WHERE status = 'pending'")
+        cur.execute('DELETE FROM "DiscoverySeedContribution"')
+        cur.execute('DELETE FROM "DiscoverySeed"')
+        cur.execute('UPDATE "WatchedArtist" SET "lastDiscoveredAt" = NULL')
+    conn.commit()
+
+
 def run_discovery(conn: psycopg.Connection, sources: list[SimilaritySource],
                   browser: MbBrowser, cfg: DiscoveryConfig, popularity=None) -> DiscoveryResult:
     """Record each seed's similar-artist contributions, then recompute affected

worker/lyra_worker/main.py

@@ -10,7 +10,7 @@ from lyra_worker.claim import claim_next, reclaim_stuck_jobs
 from lyra_worker.config import get_config
 from lyra_worker.crypto import secret_key_problem
 from lyra_worker.db import wait_for_db
-from lyra_worker.discovery import DiscoveryConfig, DiscoveryResult, run_discovery
+from lyra_worker.discovery import DiscoveryConfig, DiscoveryResult, reset_pending, run_discovery
 from lyra_worker.library import clear_staging_root
 from lyra_worker.monitor import MonitorConfig, fulfill_owned_releases, reconcile, sweep
 from lyra_worker.pipeline import run_pipeline
@@ -147,6 +147,10 @@ def maybe_run_discovery(conn, sources, browser, config, dcfg, now, last_discover
 
     starting = not in_progress
     if starting:  # begin a fresh sweep
+        if str(config.get("discover.resetRequested", "")).strip().lower() in _TRUE:
+            reset_pending(conn)  # wipe stale pending suggestions before rebuilding
+            _set_config(conn, "discover.resetRequested", "false")
+            print("worker: discovery reset — cleared pending suggestions, rebuilding", flush=True)
         _set_config(conn, "discover.inProgress", "true")
         _set_config(conn, "discover.requested", "false")
 

worker/tests/test_discovery.py

@@ -277,3 +277,32 @@ def test_run_discovery_processes_at_most_chunk_size_seeds(conn):
     with conn.cursor() as cur:
         cur.execute('SELECT count(*) FROM "WatchedArtist" WHERE "lastDiscoveredAt" IS NOT NULL')
         assert cur.fetchone()[0] == 2
+
+
+def test_reset_pending_clears_state_and_marks_seeds_due(conn):
+    from lyra_worker.discovery import reset_pending
+    from tests.conftest import insert_discovery_suggestion
+    insert_watched_artist(conn, mbid="s1", name="Seed", last_discovered_sql="now()")
+    insert_discovery_suggestion(conn, kind="artist", artist_mbid="c1", status="pending")
+    insert_discovery_suggestion(conn, kind="artist", artist_mbid="c2", status="dismissed")
+    insert_discovery_suggestion(conn, kind="artist", artist_mbid="c3", status="wanted")
+    with conn.cursor() as cur:
+        cur.execute('INSERT INTO "DiscoverySeedContribution" (id, "candidateMbid", "candidateName", '
+                    '"seedMbid", score, sources, "updatedAt") VALUES '
+                    "(gen_random_uuid()::text, 'c1', 'C1', 's1', 1.0, '{}', now())")
+        cur.execute('INSERT INTO "DiscoverySeed" (mbid, "lastDiscoveredAt") VALUES (%s, now())', ("libseed",))
+    conn.commit()
+
+    reset_pending(conn)
+
+    with conn.cursor() as cur:
+        cur.execute("SELECT count(*) FROM \"DiscoverySuggestion\" WHERE status='pending'")
+        assert cur.fetchone()[0] == 0                       # pending cleared
+        cur.execute("SELECT count(*) FROM \"DiscoverySuggestion\" WHERE status IN ('dismissed','wanted')")
+        assert cur.fetchone()[0] == 2                       # user decisions kept
+        cur.execute('SELECT count(*) FROM "DiscoverySeedContribution"')
+        assert cur.fetchone()[0] == 0
+        cur.execute('SELECT count(*) FROM "DiscoverySeed"')
+        assert cur.fetchone()[0] == 0
+        cur.execute('SELECT count(*) FROM "WatchedArtist" WHERE "lastDiscoveredAt" IS NULL')
+        assert cur.fetchone()[0] == 1                       # seed due again