feat(admin): add cache purge controls to settings

Add `purgeMetadataCache` and `purgeImageCache` procedures that let admins free disk space on demand. Metadata purge removes un-enriched stub titles not in any user's library plus orphaned person records; image purge deletes all cached TMDB files from disk.

Expose both as POST endpoints under `/admin/cache/` via the oRPC contract, implement the core logic in a new `@sofa/core/cache` module, and surface them in a new "Danger Zone" section on the Settings page with individual confirmation dialogs and a combined "Purge all" action.

packages/core/package.json

@@ -6,6 +6,7 @@
   "exports": {
     "./availability": "./src/availability.ts",
     "./backup": "./src/backup.ts",
+    "./cache": "./src/cache.ts",
     "./colors": "./src/colors.ts",
     "./credits": "./src/credits.ts",
     "./discovery": "./src/discovery.ts",

packages/core/src/cache.ts

@@ -0,0 +1,149 @@
+import { readdir, stat, unlink } from "node:fs/promises";
+import path from "node:path";
+import { CACHE_DIR } from "@sofa/config";
+import { db } from "@sofa/db/client";
+import { inArray, isNull, notInArray } from "@sofa/db/helpers";
+import { persons, titleCast, titles, userTitleStatus } from "@sofa/db/schema";
+import { createLogger } from "@sofa/logger";
+
+const log = createLogger("purge");
+
+const BATCH_SIZE = 500;
+
+/**
+ * Delete un-enriched "shell" titles that aren't in any user's library,
+ * then clean up orphaned person records.
+ */
+export function purgeMetadataCache(): {
+  deletedTitles: number;
+  deletedPersons: number;
+} {
+  return db.transaction(() => {
+    // Find shell titles (never fully fetched) not in any user's library
+    const shellTitles = db
+      .select({ id: titles.id })
+      .from(titles)
+      .where(isNull(titles.lastFetchedAt))
+      .all();
+
+    if (shellTitles.length === 0) {
+      log.info("No un-enriched titles to purge");
+      return { deletedTitles: 0, deletedPersons: purgeOrphanedPersons() };
+    }
+
+    // Filter out titles that are in any user's library
+    const libraryTitleIds = new Set(
+      db
+        .select({ titleId: userTitleStatus.titleId })
+        .from(userTitleStatus)
+        .all()
+        .map((r) => r.titleId),
+    );
+
+    const toDelete = shellTitles
+      .map((t) => t.id)
+      .filter((id) => !libraryTitleIds.has(id));
+
+    if (toDelete.length === 0) {
+      log.info("All un-enriched titles are in user libraries, skipping");
+      return { deletedTitles: 0, deletedPersons: purgeOrphanedPersons() };
+    }
+
+    // Delete in batches to respect SQLite variable limits
+    for (let i = 0; i < toDelete.length; i += BATCH_SIZE) {
+      const batch = toDelete.slice(i, i + BATCH_SIZE);
+      db.delete(titles).where(inArray(titles.id, batch)).run();
+    }
+    const deletedTitles = toDelete.length;
+
+    log.info(`Purged ${deletedTitles} un-enriched titles`);
+
+    const deletedPersons = purgeOrphanedPersons();
+
+    return { deletedTitles, deletedPersons };
+  });
+}
+
+/**
+ * Delete person records that have no remaining titleCast references.
+ */
+function purgeOrphanedPersons(): number {
+  const orphanedPersons = db
+    .select({ id: persons.id })
+    .from(persons)
+    .where(
+      notInArray(
+        persons.id,
+        db.selectDistinct({ personId: titleCast.personId }).from(titleCast),
+      ),
+    )
+    .all();
+
+  if (orphanedPersons.length === 0) return 0;
+
+  const ids = orphanedPersons.map((p) => p.id);
+  for (let i = 0; i < ids.length; i += BATCH_SIZE) {
+    const batch = ids.slice(i, i + BATCH_SIZE);
+    db.delete(persons).where(inArray(persons.id, batch)).run();
+  }
+  const deletedPersons = ids.length;
+
+  log.info(`Purged ${deletedPersons} orphaned persons`);
+  return deletedPersons;
+}
+
+/** Image cache subdirectories to scan */
+const IMAGE_CATEGORIES = [
+  "posters",
+  "backdrops",
+  "stills",
+  "logos",
+  "profiles",
+] as const;
+
+/**
+ * Delete all cached images from disk.
+ * Returns the count of files deleted and total bytes freed.
+ */
+export async function purgeImageCache(): Promise<{
+  deletedFiles: number;
+  freedBytes: number;
+}> {
+  let deletedFiles = 0;
+  let freedBytes = 0;
+
+  for (const category of IMAGE_CATEGORIES) {
+    const dir = path.join(CACHE_DIR, category);
+
+    let entries: string[];
+    try {
+      entries = await readdir(dir);
+    } catch {
+      // Directory doesn't exist yet, skip
+      continue;
+    }
+
+    for (const filename of entries) {
+      // Skip hidden files and temp files
+      if (filename.startsWith(".")) continue;
+
+      const filePath = path.join(dir, filename);
+      try {
+        const fileStat = await stat(filePath);
+        if (!fileStat.isFile()) continue;
+
+        freedBytes += fileStat.size;
+        await unlink(filePath);
+        deletedFiles++;
+      } catch (err) {
+        log.warn(`Failed to delete ${filePath}:`, err);
+      }
+    }
+  }
+
+  log.info(
+    `Purged image cache: ${deletedFiles} files, ${(freedBytes / (1024 * 1024)).toFixed(1)} MB freed`,
+  );
+
+  return { deletedFiles, freedBytes };
+}

packages/core/test/image-cache.test.ts

@@ -1,27 +1,26 @@
-import { afterEach, beforeEach, describe, expect, mock, test } from "bun:test";
+import { afterEach, beforeEach, describe, expect, spyOn, test } from "bun:test";
 import { loadImageBuffer } from "../src/image-cache";
 
-const originalFetch = globalThis.fetch;
-
 beforeEach(() => {
   process.env.IMAGE_CACHE_ENABLED = "false";
 });
 
 afterEach(() => {
-  globalThis.fetch = originalFetch;
   delete process.env.IMAGE_CACHE_ENABLED;
 });
 
 describe("loadImageBuffer", () => {
   test("uses category-specific TMDB sizes when cache is disabled", async () => {
     const urls: string[] = [];
-    globalThis.fetch = mock(async (input: string | URL | Request) => {
+    const fetchSpy = spyOn(globalThis, "fetch").mockImplementation((async (
+      input: string | URL | Request,
+    ) => {
       urls.push(String(input));
       return new Response(new Uint8Array([1, 2, 3]), {
         status: 200,
         headers: { "content-type": "image/jpeg" },
       });
-    }) as unknown as typeof fetch;
+    }) as typeof fetch);
 
     await loadImageBuffer("/poster.jpg", "posters");
     await loadImageBuffer("/profile.jpg", "profiles");
@@ -30,5 +29,7 @@ describe("loadImageBuffer", () => {
       "https://image.tmdb.org/t/p/w500/poster.jpg",
       "https://image.tmdb.org/t/p/w185/profile.jpg",
     ]);
+
+    fetchSpy.mockRestore();
   });
 });