feat: implement account service and db

migration/002_account.up.sql

@@ -0,0 +1,17 @@
+
+CREATE TABLE account (
+	id TEXT NOT NULL UNIQUE PRIMARY KEY,
+	group_id TEXT NOT NULL,
+
+	name TEXT NOT NULL,
+
+	current_balance int64 NOT NULL,
+	last_transaction DATETIME,
+	oink_balance int64 NOT NULL,
+
+	created_at DATETIME NOT NULL,
+	created_by TEXT NOT NULL,
+	updated_at DATETIME,
+	updated_by TEXT,
+) WITHOUT ROWID;
+