Poster search through a posters table and releases_poster_newest_idx; complete releases are final; the tail before everything (-3)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/functional/final_completeness.spec.ts

@@ -61,7 +61,7 @@ test.group('Final completeness', (group) => {
     }
     const final = async (id: number) => {
       const r = await db.from('releases').where('id', id).firstOrFail()
-      const { rows } = await db.rawQuery(`SELECT release_final(?, ?, ?, ?, ?) AS final`, [r.group_id, r.first_article, r.last_article, r.posted_at, r.last_posted_at])
+      const { rows } = await db.rawQuery(`SELECT release_final(?, ?, ?, ?, ?, ?) AS final`, [r.group_id, r.first_article, r.last_article, r.posted_at, r.last_posted_at, r.complete])
       return rows[0].final as boolean
     }
 
@@ -76,6 +76,8 @@ test.group('Final completeness', (group) => {
     assert.isTrue(await final(middle))
     assert.isTrue(await final(first))
     assert.isFalse(await final(edge))
+    // Complete there: every file found, nothing to wait for.
+    assert.isTrue(await final(await release(196_000, '2026-01-01T22:30:00Z', { files: 5, complete: true, name: 'Complete.Edge' })))
     assert.isFalse(await final(island))
 
     // Search: an incomplete release that isn't final isn't left out as incomplete; the API says which is final.