Add backend

backend/migrations/2023-09-21-174215_add_song_table/down.sql

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+DROP TABLE song;
+

backend/migrations/2023-09-21-174215_add_song_table/up.sql

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+CREATE TABLE song(
+    song_hash TEXT NOT NULL PRIMARY KEY,
+    title TEXT NOT NULL,
+    artist TEXT NOT NULL,
+    cover TEXT,
+    language TEXT,
+    video TEXT,
+    year TEXT,
+    genre TEXT,
+    bpm TEXT NOT NULL,
+    duet_singer_1 TEXT,
+    duet_singer_2 TEXT
+);