feat: add database connections, initial migration and early CLI tooling

Entities/SongInteraction.cs

@@ -0,0 +1,15 @@
+namespace Shadow.Entities;
+public class SongInteraction
+{
+	public int Id { get; set; }
+	required public int SongId { get; set; }
+	required public int UserId { get; set; }
+	DateTime? PlayDate { get; set; } = null;
+	public int PlayCount { get; set; } = 0;
+	public bool? Starred { get; set; } = false;
+	public int Rating { get; set; } = 0;
+
+	public Song? Song { get; set; }
+	public User? User { get; set; }
+
+}