Sync from /srv/compose/unified-media-manager

internal/db/migrations/005_metadata_cache.sql

@@ -0,0 +1,12 @@
+CREATE TABLE metadata_cache (
+    id BIGSERIAL PRIMARY KEY,
+    provider TEXT NOT NULL,
+    provider_id TEXT NOT NULL,
+    media_type TEXT NOT NULL,
+    data JSONB NOT NULL,
+    cached_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    expires_at TIMESTAMPTZ NOT NULL
+);
+
+CREATE UNIQUE INDEX idx_metadata_cache_lookup ON metadata_cache (provider, provider_id);
+CREATE INDEX idx_metadata_cache_expired ON metadata_cache (expires_at) WHERE expires_at < NOW();