Added merge

furumi-agent/migrations/0003_artist_merges.sql

@@ -0,0 +1,10 @@
+CREATE TABLE artist_merges (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    status TEXT NOT NULL DEFAULT 'pending',
+    source_artist_ids TEXT NOT NULL,
+    proposal TEXT,
+    llm_notes TEXT,
+    error_message TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);