feat(treasurechest): #64 implement hirarchical treasure chests

migration/003_treasure_chest.up.sql

@@ -0,0 +1,16 @@
+
+CREATE TABLE treasure_chest (
+	id TEXT NOT NULL UNIQUE PRIMARY KEY,
+	parent_id TEXT,
+	user_id TEXT NOT NULL,
+
+	name TEXT NOT NULL,
+
+	current_balance int64 NOT NULL,
+
+	created_at DATETIME NOT NULL,
+	created_by TEXT NOT NULL,
+	updated_at DATETIME,
+	updated_by TEXT
+) WITHOUT ROWID;
+