import sqlite3

conn_source = sqlite3.connect('db/source.db')
conn_target = sqlite3.connect('db/memos_prod.db')

cur_source = conn_source.cursor()
cur_target = conn_target.cursor()

#? change here
cur_source.execute('SELECT * FROM tag')
rows = cur_source.fetchall()

#? change here
for row in rows:
    cur_target.execute('INSERT INTO tag VALUES (?, ?)', row) # 假设表有两列

conn_target.commit()

conn_source.close()
conn_target.close()