diff --git a/tests/test_admin_gating.py b/tests/test_admin_gating.py
new file mode 100644
index 00000000..6ab66818
--- /dev/null
+++ b/tests/test_admin_gating.py
@@ -0,0 +1,80 @@
+"""Phase 3: server-side admin gating of shared/global-destructive endpoints.
+
+The audit found these were callable by any profile (UI hid them, the API didn't).
+For a real multi-user setup that's unsafe — a non-admin could restore/vacuum the
+DB, wipe the shared library, clear the Plex library, or mint API keys. These
+assert the @admin_only gate now blocks non-admins, that admin is NOT blocked
+(zero change for single-profile installs, where everyone is the default admin),
+and crucially that a PROFILE-SCOPED op (clearing your OWN wishlist) was NOT
+over-gated.
+"""
+
+from __future__ import annotations
+
+import os
+import tempfile
+
+import pytest
+
+_TMP = tempfile.mkdtemp(prefix='ss-admin-gate-')
+os.environ['DATABASE_PATH'] = os.path.join(_TMP, 'gate.db')
+os.environ['SOULSYNC_TEST_DB_READY'] = '1'
+
+web_server = pytest.importorskip('web_server')
+
+
+# (method, path) for every endpoint that must be admin-only.
+GATED = [
+    ('GET', '/api/v1/api-keys-internal'),
+    ('POST', '/api/v1/api-keys-internal/generate'),
+    ('DELETE', '/api/v1/api-keys-internal/revoke/abc'),
+    ('POST', '/api/plex/clear-library'),
+    ('PUT', '/api/library/clear-match'),
+    ('DELETE', '/api/library/track/123'),
+    ('DELETE', '/api/library/album/123'),
+    ('POST', '/api/library/tracks/delete-batch'),
+    ('POST', '/api/database/update'),
+    ('POST', '/api/database/backup'),
+    ('DELETE', '/api/database/backups/x.db'),
+    ('POST', '/api/database/backups/x.db/restore'),
+    ('POST', '/api/database/maintenance/vacuum'),
+    ('DELETE', '/api/metadata-cache/clear'),
+    ('DELETE', '/api/metadata-cache/clear-musicbrainz'),
+]
+
+
+@pytest.fixture
+def client():
+    return web_server.app.test_client()
+
+
+@pytest.fixture
+def nonadmin(client):
+    pid = web_server.get_database().create_profile(name=f'u_{os.urandom(3).hex()}')
+    with client.session_transaction() as sess:
+        sess['profile_id'] = pid
+    return pid
+
+
+def _call(client, method, path):
+    return client.open(path, method=method, json={})
+
+
+@pytest.mark.parametrize('method,path', GATED)
+def test_nonadmin_blocked(client, nonadmin, method, path):
+    # @admin_only returns 403 BEFORE the view body runs, so this never triggers
+    # the underlying destructive operation — safe to assert across all of them.
+    assert _call(client, method, path).status_code == 403, f"{method} {path} should be 403 for non-admin"
+
+
+def test_admin_not_blocked_by_the_gate(client):
+    # Default session = profile 1 (admin). Prove the gate lets admin through on a
+    # SAFE, read-only gated endpoint (listing API keys) — confirming the no-change
+    # guarantee for single-profile installs without triggering a destructive op.
+    assert client.get('/api/v1/api-keys-internal').status_code != 403
+
+
+def test_profile_scoped_wishlist_clear_not_overgated(client, nonadmin):
+    # Clearing your OWN wishlist is profile-scoped data — a non-admin MUST still
+    # be allowed. This is the guard against a blanket sweep.
+    assert _call(client, 'POST', '/api/wishlist/clear').status_code != 403
diff --git a/web_server.py b/web_server.py
index 36fb9aeb..3b195811 100644
--- a/web_server.py
+++ b/web_server.py
@@ -2927,6 +2927,7 @@ def get_activity_logs():
 
 # --- Internal API Key Management (browser-only, no auth) ---
 @app.route('/api/v1/api-keys-internal', methods=['GET'])
+@admin_only
 def list_api_keys_internal():
     """List API keys for the settings page (no auth required — same as all UI routes)."""
     keys = config_manager.get('api_keys', [])
@@ -2943,6 +2944,7 @@ def list_api_keys_internal():
     return jsonify({"success": True, "data": {"keys": safe_keys}})
 
 @app.route('/api/v1/api-keys-internal/generate', methods=['POST'])
+@admin_only
 def generate_api_key_internal():
     """Generate API key from settings page (no auth required)."""
     from api.auth import generate_api_key
@@ -2961,6 +2963,7 @@ def generate_api_key_internal():
     }}), 201
 
 @app.route('/api/v1/api-keys-internal/revoke/<key_id>', methods=['DELETE'])
+@admin_only
 def revoke_api_key_internal(key_id):
     """Revoke API key from settings page (no auth required)."""
     keys = config_manager.get('api_keys', [])
@@ -4040,6 +4043,7 @@ def get_plex_pin_status():
 
 
 @app.route('/api/plex/clear-library', methods=['POST'])
+@admin_only
 def clear_plex_library_preference():
     try:
         from database.music_database import MusicDatabase
@@ -11636,6 +11640,7 @@ def library_manual_match():
         logger.error(f"Error manual matching: {e}")
 
 @app.route('/api/library/clear-match', methods=['PUT'])
+@admin_only
 def library_clear_match():
     """Clear a service ID match for an entity, reverting it to not_found.
     Body: { entity_type: str, entity_id: str, service: str }
@@ -11751,6 +11756,7 @@ def library_import_existing_track_for_missing_slot(album_id):
 
 
 @app.route('/api/library/track/<track_id>', methods=['DELETE'])
+@admin_only
 def library_delete_track(track_id):
     """Delete a track from the database, optionally deleting the file and blacklisting the source."""
     try:
@@ -12322,6 +12328,7 @@ def sync_artist_library(artist_id):
         return jsonify({"success": False, "error": str(e)}), 500
 
 @app.route('/api/library/album/<album_id>', methods=['DELETE'])
+@admin_only
 def library_delete_album(album_id):
     """Delete an album and all its tracks from the database, optionally deleting files on disk."""
     try:
@@ -12399,6 +12406,7 @@ def library_delete_album(album_id):
 
 
 @app.route('/api/library/tracks/delete-batch', methods=['POST'])
+@admin_only
 def library_delete_tracks_batch():
     """Delete multiple track records from the database (does NOT delete files on disk).
     Body: { track_ids: [int] }
@@ -16055,6 +16063,7 @@ def add_album_track_to_wishlist():
         return jsonify({"success": False, "error": str(e)}), 500
 
 @app.route('/api/database/update', methods=['POST'])
+@admin_only
 def start_database_update():
     """Endpoint to start the database update process."""
     global db_update_worker
@@ -16111,6 +16120,7 @@ def stop_database_update():
 _BACKUP_FILENAME_RE = re.compile(r'^music_library\.db\.backup_\d{8}_\d{6}$')
 
 @app.route('/api/database/backup', methods=['POST'])
+@admin_only
 def backup_database_endpoint():
     """Create a rolling backup of the database (max 5)."""
     try:
@@ -16202,6 +16212,7 @@ def list_backups_endpoint():
         return jsonify({"success": False, "error": str(e)}), 500
 
 @app.route('/api/database/backups/<filename>', methods=['DELETE'])
+@admin_only
 def delete_backup_endpoint(filename):
     """Delete a specific database backup."""
     try:
@@ -16224,6 +16235,7 @@ def delete_backup_endpoint(filename):
         return jsonify({"success": False, "error": str(e)}), 500
 
 @app.route('/api/database/backups/<filename>/restore', methods=['POST'])
+@admin_only
 def restore_backup_endpoint(filename):
     """Restore the database from a specific backup."""
     try:
@@ -16367,6 +16379,7 @@ def database_maintenance_info():
 
 
 @app.route('/api/database/maintenance/vacuum', methods=['POST'])
+@admin_only
 def database_vacuum():
     """Run VACUUM to compact the database. Locks DB during operation."""
     try:
@@ -16556,6 +16569,7 @@ def metadata_cache_browse_musicbrainz():
         return jsonify({"error": str(e)}), 500
 
 @app.route('/api/metadata-cache/clear', methods=['DELETE'])
+@admin_only
 def metadata_cache_clear():
     """Clear cached metadata. Optional query params: source, type."""
     try:
@@ -16583,6 +16597,7 @@ def metadata_cache_evict():
         return jsonify({"success": False, "error": str(e)}), 500
 
 @app.route('/api/metadata-cache/clear-musicbrainz', methods=['DELETE'])
+@admin_only
 def metadata_cache_clear_musicbrainz():
     """Clear MusicBrainz cache entries. Optional query param: failed_only=true."""
     try: