feat(db): change table

Why not use jsonb?

scripts/create_table.sql

@@ -1,22 +1,18 @@
 -- 创建账户表
 CREATE TABLE account (
   a_id SERIAL PRIMARY KEY,
-  balance DECIMAL(10, 2),
   meta JSONB
 );
 
 -- 创建类别表
 CREATE TABLE category (
   c_id SERIAL PRIMARY KEY,
-  income_type boolean,
   meta JSONB
 );
 
 -- 创建流水表
 CREATE TABLE transaction (
   t_id SERIAL PRIMARY KEY,
-  amount DECIMAL(10, 2),
-  date DATE,
   c_id INTEGER REFERENCES category(c_id),
   a_id INTEGER REFERENCES account(a_id),
   meta JSONB