Added AI agent to manage metadata

furumi-agent/migrations/0002_covers_and_slugs.sql

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+-- Add slug (public unique ID) to tracks
+ALTER TABLE tracks ADD COLUMN slug TEXT;
+
+-- Generate slugs for existing tracks
+UPDATE tracks SET slug = encode(gen_random_uuid()::text::bytea, 'hex') WHERE slug IS NULL;
+
+ALTER TABLE tracks ALTER COLUMN slug SET NOT NULL;
+CREATE UNIQUE INDEX idx_tracks_slug ON tracks (slug);
+
+-- Add slug to albums
+ALTER TABLE albums ADD COLUMN slug TEXT;
+UPDATE albums SET slug = encode(gen_random_uuid()::text::bytea, 'hex') WHERE slug IS NULL;
+ALTER TABLE albums ALTER COLUMN slug SET NOT NULL;
+CREATE UNIQUE INDEX idx_albums_slug ON albums (slug);
+
+-- Add slug to artists
+ALTER TABLE artists ADD COLUMN slug TEXT;
+UPDATE artists SET slug = encode(gen_random_uuid()::text::bytea, 'hex') WHERE slug IS NULL;
+ALTER TABLE artists ALTER COLUMN slug SET NOT NULL;
+CREATE UNIQUE INDEX idx_artists_slug ON artists (slug);
+
+-- Album artwork table
+CREATE TABLE album_images (
+    id          BIGSERIAL PRIMARY KEY,
+    album_id    BIGINT NOT NULL REFERENCES albums(id) ON DELETE CASCADE,
+    image_type  TEXT NOT NULL DEFAULT 'cover',  -- 'cover', 'back', 'booklet', 'other'
+    file_path   TEXT NOT NULL,                  -- relative path in storage
+    file_hash   TEXT NOT NULL,
+    mime_type   TEXT NOT NULL,
+    width       INT,
+    height      INT,
+    file_size   BIGINT NOT NULL,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_album_images_album ON album_images (album_id);
+CREATE UNIQUE INDEX idx_album_images_hash ON album_images (file_hash);