Initial commit: KeySelector implementation

db/schema.sql

@@ -0,0 +1,20 @@
+-- Schema for KeySelector and AcousticBrainz data
+
+CREATE TABLE IF NOT EXISTS tracks (
+    id SERIAL PRIMARY KEY,
+    mbid VARCHAR(36) UNIQUE NOT NULL, -- MusicBrainz ID
+    title VARCHAR(255),
+    artist VARCHAR(255),
+    camelot_key VARCHAR(3),
+    bpm INTEGER,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS track_tags (
+    track_id INTEGER REFERENCES tracks(id),
+    tag VARCHAR(100),
+    PRIMARY KEY (track_id, tag)
+);
+
+CREATE INDEX IF NOT EXISTS idx_camelot_key ON tracks(camelot_key);
+CREATE INDEX IF NOT EXISTS idx_bpm ON tracks(bpm);