Clarify storage limits and unify file metadata displays

tests/docker/persistence.mjs

@@ -151,6 +151,12 @@ try {
     );
     assert.equal(settings.maxConcurrentUploads, 3);
     assert.deepEqual(settings.blockedCountries, ['CN']);
+    const contexts = JSON.parse(
+      node(
+        `import Database from 'better-sqlite3'; const db=new Database('/data/database/hop.sqlite');console.log(JSON.stringify(db.prepare('SELECT count(*) AS count FROM file_upload_contexts').get()));db.close();`,
+      ),
+    );
+    assert.ok(contexts.count > 0, 'per-file upload location snapshots survive restart');
   }
   const preservedText = JSON.parse(
     node(