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refactor(db): greatly simplify database migrations

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s3lph 2024-12-08 00:05:28 +01:00
parent 1823759433
commit ddf5ed01a2
Signed by: s3lph
GPG key ID: 0AA29A52FB33CFB5
5 changed files with 75 additions and 1004 deletions
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55
matemat/db/migrations.py
View file

@ -4,7 +4,44 @@ from typing import Dict
import sqlite3
def migrate_schema_1_to_2(c: sqlite3.Cursor):
def migrate_schema_1(c: sqlite3.Cursor):
c.execute('''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0
)
''')
c.execute('''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) NOT NULL DEFAULT 0,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL
)
''')
c.execute('''
CREATE TABLE consumption (
user_id INTEGER NOT NULL,
product_id INTEGER NOT NULL,
count INTEGER(8) NOT NULL DEFAULT 0,
PRIMARY KEY (user_id, product_id),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (product_id) REFERENCES products(product_id)
ON DELETE CASCADE ON UPDATE CASCADE
)
''')
def migrate_schema_2(c: sqlite3.Cursor):
# Create missing tables
c.execute('''
CREATE TABLE transactions (
@ -115,7 +152,7 @@ def migrate_schema_1_to_2(c: sqlite3.Cursor):
c.execute('DROP TABLE consumption')
def migrate_schema_2_to_3(c: sqlite3.Cursor):
def migrate_schema_3(c: sqlite3.Cursor):
# Add missing columns to users table
c.execute('ALTER TABLE users ADD COLUMN receipt_pref INTEGER(1) NOT NULL DEFAULT 0')
c.execute('''ALTER TABLE users ADD COLUMN created INTEGER(8) NOT NULL DEFAULT 0''')
@ -203,7 +240,7 @@ def migrate_schema_2_to_3(c: sqlite3.Cursor):
''')
def migrate_schema_3_to_4(c: sqlite3.Cursor):
def migrate_schema_4(c: sqlite3.Cursor):
# Change receipts schema to allow null for transaction IDs
c.execute('''
CREATE TEMPORARY TABLE receipts_temp (
@ -241,7 +278,7 @@ def migrate_schema_3_to_4(c: sqlite3.Cursor):
c.execute('DROP TABLE receipts_temp')
def migrate_schema_4_to_5(c: sqlite3.Cursor):
def migrate_schema_5(c: sqlite3.Cursor):
# Change products schema to allow null for stock and add stockable column
c.execute('''
CREATE TEMPORARY TABLE products_temp (
@ -270,7 +307,7 @@ def migrate_schema_4_to_5(c: sqlite3.Cursor):
c.execute('DROP TABLE products_temp')
def migrate_schema_5_to_6(c: sqlite3.Cursor):
def migrate_schema_6(c: sqlite3.Cursor):
# Add custom_price column
c.execute('''
ALTER TABLE products ADD COLUMN
@ -278,7 +315,7 @@ def migrate_schema_5_to_6(c: sqlite3.Cursor):
''')
def migrate_schema_6_to_7(c: sqlite3.Cursor):
def migrate_schema_7(c: sqlite3.Cursor):
# Add custom_price column
c.execute('''
ALTER TABLE users ADD COLUMN
@ -286,7 +323,7 @@ def migrate_schema_6_to_7(c: sqlite3.Cursor):
''')
def migrate_schema_7_to_8(c: sqlite3.Cursor):
def migrate_schema_8(c: sqlite3.Cursor):
# Add ean column
c.execute('''
ALTER TABLE products ADD COLUMN ean TEXT DEFAULT NULL
@ -297,7 +334,7 @@ def migrate_schema_7_to_8(c: sqlite3.Cursor):
''')
def migrate_schema_8_to_9(c: sqlite3.Cursor):
def migrate_schema_9(c: sqlite3.Cursor):
c.execute('''
CREATE TABLE tokens (
token_id INTEGER PRIMARY KEY,
@ -311,7 +348,7 @@ def migrate_schema_8_to_9(c: sqlite3.Cursor):
''')
def migrate_schema_9_to_10(c: sqlite3.Cursor):
def migrate_schema_10(c: sqlite3.Cursor):
c.execute('''
ALTER TABLE users RENAME TO users_old
''')

764
matemat/db/schemas.py
View file

@ -1,764 +0,0 @@
from typing import Dict, List
SCHEMAS: Dict[int, List[str]] = dict()
SCHEMAS[1] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) NOT NULL DEFAULT 0,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL
);
''',
'''
CREATE TABLE consumption (
user_id INTEGER NOT NULL,
product_id INTEGER NOT NULL,
count INTEGER(8) NOT NULL DEFAULT 0,
PRIMARY KEY (user_id, product_id),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (product_id) REFERENCES products(product_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''']
SCHEMAS[2] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) NOT NULL DEFAULT 0,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product_id INTEGER DEFAULT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (product_id) REFERENCES products(product_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent_id INTEGER NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (agent_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''']
SCHEMAS[3] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0,
receipt_pref INTEGER(1) NOT NULL DEFAULT 0,
created INTEGER(8) NOT NULL DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) NOT NULL DEFAULT 0,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER DEFAULT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product TEXT NOT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER NOT NULL,
last_ta_id INTEGER NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''']
SCHEMAS[4] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0,
receipt_pref INTEGER(1) NOT NULL DEFAULT 0,
created INTEGER(8) NOT NULL DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) NOT NULL DEFAULT 0,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER DEFAULT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product TEXT NOT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER DEFAULT NULL,
last_ta_id INTEGER DEFAULT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''']
SCHEMAS[5] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0,
receipt_pref INTEGER(1) NOT NULL DEFAULT 0,
created INTEGER(8) NOT NULL DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) DEFAULT 0,
stockable INTEGER(1) DEFAULT 1,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER DEFAULT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product TEXT NOT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER DEFAULT NULL,
last_ta_id INTEGER DEFAULT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''']
SCHEMAS[6] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0,
receipt_pref INTEGER(1) NOT NULL DEFAULT 0,
created INTEGER(8) NOT NULL DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) DEFAULT 0,
stockable INTEGER(1) DEFAULT 1,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL,
custom_price INTEGER(1) DEFAULT 0
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER DEFAULT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product TEXT NOT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER DEFAULT NULL,
last_ta_id INTEGER DEFAULT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''']
SCHEMAS[7] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0,
receipt_pref INTEGER(1) NOT NULL DEFAULT 0,
created INTEGER(8) NOT NULL DEFAULT 0,
logout_after_purchase INTEGER(1) DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) DEFAULT 0,
stockable INTEGER(1) DEFAULT 1,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL,
custom_price INTEGER(1) DEFAULT 0
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER DEFAULT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product TEXT NOT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER DEFAULT NULL,
last_ta_id INTEGER DEFAULT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''']
SCHEMAS[8] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0,
receipt_pref INTEGER(1) NOT NULL DEFAULT 0,
created INTEGER(8) NOT NULL DEFAULT 0,
logout_after_purchase INTEGER(1) DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) DEFAULT 0,
stockable INTEGER(1) DEFAULT 1,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL,
custom_price INTEGER(1) DEFAULT 0,
ean TEXT UNIQUE DEFAULT NULL
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER DEFAULT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product TEXT NOT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER DEFAULT NULL,
last_ta_id INTEGER DEFAULT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''']
SCHEMAS[9] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0,
receipt_pref INTEGER(1) NOT NULL DEFAULT 0,
created INTEGER(8) NOT NULL DEFAULT 0,
logout_after_purchase INTEGER(1) DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) DEFAULT 0,
stockable INTEGER(1) DEFAULT 1,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL,
custom_price INTEGER(1) DEFAULT 0,
ean TEXT UNIQUE DEFAULT NULL
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER DEFAULT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product TEXT NOT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER DEFAULT NULL,
last_ta_id INTEGER DEFAULT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE tokens ( -- authentication tokens such as barcodes
token_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
token TEXT UNIQUE NOT NULL,
name TEXT UNIQUE NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''']
SCHEMAS[10] = [
'''
CREATE TABLE users (
user_id INTEGER PRIMARY KEY,
username TEXT UNIQUE NOT NULL COLLATE NOCASE,
email TEXT DEFAULT NULL,
password TEXT NOT NULL,
touchkey TEXT DEFAULT NULL,
is_admin INTEGER(1) NOT NULL DEFAULT 0,
is_member INTEGER(1) NOT NULL DEFAULT 1,
balance INTEGER(8) NOT NULL DEFAULT 0,
lastchange INTEGER(8) NOT NULL DEFAULT 0,
receipt_pref INTEGER(1) NOT NULL DEFAULT 0,
created INTEGER(8) NOT NULL DEFAULT 0,
logout_after_purchase INTEGER(1) DEFAULT 0
);
''',
'''
CREATE TABLE products (
product_id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL,
stock INTEGER(8) DEFAULT 0,
stockable INTEGER(1) DEFAULT 1,
price_member INTEGER(8) NOT NULL,
price_non_member INTEGER(8) NOT NULL,
custom_price INTEGER(1) DEFAULT 0,
ean TEXT UNIQUE DEFAULT NULL
);
''',
'''
CREATE TABLE transactions ( -- "superclass" of the following 3 tables
ta_id INTEGER PRIMARY KEY,
user_id INTEGER DEFAULT NULL,
value INTEGER(8) NOT NULL,
old_balance INTEGER(8) NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE consumptions ( -- transactions involving buying a product
ta_id INTEGER PRIMARY KEY,
product TEXT NOT NULL,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE deposits ( -- transactions involving depositing cash
ta_id INTEGER PRIMARY KEY,
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE modifications ( -- transactions involving balance modification by an admin
ta_id INTEGER NOT NULL,
agent TEXT NOT NULL,
reason TEXT DEFAULT NULL,
PRIMARY KEY (ta_id),
FOREIGN KEY (ta_id) REFERENCES transactions(ta_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''',
'''
CREATE TABLE receipts ( -- receipts sent to the users
receipt_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
first_ta_id INTEGER DEFAULT NULL,
last_ta_id INTEGER DEFAULT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (first_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE,
FOREIGN KEY (last_ta_id) REFERENCES transactions(ta_id)
ON DELETE SET NULL ON UPDATE CASCADE
);
''',
'''
CREATE TABLE tokens ( -- authentication tokens such as barcodes
token_id INTEGER PRIMARY KEY,
user_id INTEGER NOT NULL,
token TEXT UNIQUE NOT NULL,
name TEXT UNIQUE NOT NULL,
date INTEGER(8) DEFAULT (STRFTIME('%s', 'now')),
FOREIGN KEY (user_id) REFERENCES users(user_id)
ON DELETE CASCADE ON UPDATE CASCADE
);
''']

197
matemat/db/test/test_migrations.py
View file

@ -1,10 +1,10 @@
import unittest
from unittest.mock import PropertyMock, patch
import sqlite3
from matemat.db import DatabaseWrapper
from matemat.db.schemas import SCHEMAS
class TestMigrations(unittest.TestCase):
@ -15,204 +15,13 @@ class TestMigrations(unittest.TestCase):
def _initialize_db(self, schema_version: int):
self.db._sqlite_db = sqlite3.connect(':memory:')
cursor: sqlite3.Cursor = self.db._sqlite_db.cursor()
cursor.execute('BEGIN EXCLUSIVE')
for cmd in SCHEMAS[schema_version]:
cursor.execute(cmd)
cursor.execute('COMMIT')
self.db._setup()
def test_downgrade_fail(self):
# Test that downgrades are forbidden
self.db.SCHEMA_VERSION = 1
self.db._sqlite_db = sqlite3.connect(':memory:')
self.db._sqlite_db.execute('PRAGMA user_version = 2')
with patch('matemat.db.DatabaseWrapper.schema_version', new_callable=PropertyMock(return_value=1)):
with self.assertRaises(RuntimeError):
with self.db:
pass
def test_upgrade_1_to_2(self):
# Setup test db with example entries covering - hopefully - all cases
self._initialize_db(1)
cursor: sqlite3.Cursor = self.db._sqlite_db.cursor()
cursor.execute('''
INSERT INTO users VALUES
(1, 'testadmin', 'a@b.c', '$2a$10$herebehashes', NULL, 1, 1, 1337, 0),
(2, 'testuser', NULL, '$2a$10$herebehashes', '$2a$10$herebehashes', 0, 1, 4242, 0),
(3, 'alien', NULL, '$2a$10$herebehashes', '$2a$10$herebehashes', 0, 0, 1234, 0)
''')
cursor.execute('''
INSERT INTO products VALUES
(1, 'Club Mate', 42, 200, 250),
(2, 'Flora Power Mate (1/4l)', 10, 100, 150)
''')
cursor.execute('''
INSERT INTO consumption VALUES
(1, 1, 5), (1, 2, 3), (2, 2, 10), (3, 1, 3), (3, 2, 4)
''')
cursor.execute('PRAGMA user_version = 1')
# Kick off the migration
schema_version = self.db.SCHEMA_VERSION
self.db.SCHEMA_VERSION = 2
self.db._setup()
self.db.SCHEMA_VERSION = schema_version
# Test whether the new tables were created
cursor.execute('PRAGMA table_info(transactions)')
self.assertNotEqual(0, len(cursor.fetchall()))
cursor.execute('PRAGMA table_info(consumptions)')
self.assertNotEqual(0, len(cursor.fetchall()))
cursor.execute('PRAGMA table_info(deposits)')
self.assertNotEqual(0, len(cursor.fetchall()))
cursor.execute('PRAGMA table_info(modifications)')
self.assertNotEqual(0, len(cursor.fetchall()))
# Test whether the old consumption table was dropped
cursor.execute('PRAGMA table_info(consumption)')
self.assertEqual(0, len(cursor.fetchall()))
# Test number of entries in the new tables
cursor.execute('SELECT COUNT(ta_id) FROM transactions')
self.assertEqual(25, cursor.fetchone()[0])
cursor.execute('SELECT COUNT(ta_id) FROM consumptions')
self.assertEqual(25, cursor.fetchone()[0])
cursor.execute('SELECT COUNT(ta_id) FROM deposits')
self.assertEqual(0, cursor.fetchone()[0])
cursor.execute('SELECT COUNT(ta_id) FROM modifications')
self.assertEqual(0, cursor.fetchone()[0])
# The (user_id=2 x product_id=1) combination should never appear
cursor.execute('''
SELECT COUNT(t.ta_id)
FROM transactions AS t
LEFT JOIN consumptions AS c
ON t.ta_id = c.ta_id
WHERE t.user_id = 2 AND c.product_id = 1''')
self.assertEqual(0, cursor.fetchone()[0])
# Test that one entry per consumption was created, and their values match the negative price
cursor.execute('''
SELECT COUNT(t.ta_id)
FROM transactions AS t
LEFT JOIN consumptions AS c
ON t.ta_id = c.ta_id
WHERE t.user_id = 1 AND c.product_id = 1 AND t.value = -200''')
self.assertEqual(5, cursor.fetchone()[0])
cursor.execute('''
SELECT COUNT(t.ta_id)
FROM transactions AS t
LEFT JOIN consumptions AS c
ON t.ta_id = c.ta_id
WHERE t.user_id = 1 AND c.product_id = 2 AND t.value = -100''')
self.assertEqual(3, cursor.fetchone()[0])
cursor.execute('''
SELECT COUNT(t.ta_id)
FROM transactions AS t
LEFT JOIN consumptions AS c
ON t.ta_id = c.ta_id
WHERE t.user_id = 2 AND c.product_id = 2 AND t.value = -100''')
self.assertEqual(10, cursor.fetchone()[0])
cursor.execute('''
SELECT COUNT(t.ta_id)
FROM transactions AS t
LEFT JOIN consumptions AS c
ON t.ta_id = c.ta_id
WHERE t.user_id = 3 AND c.product_id = 1 AND t.value = -250''')
self.assertEqual(3, cursor.fetchone()[0])
cursor.execute('''
SELECT COUNT(t.ta_id)
FROM transactions AS t
LEFT JOIN consumptions AS c
ON t.ta_id = c.ta_id
WHERE t.user_id = 3 AND c.product_id = 2 AND t.value = -150''')
self.assertEqual(4, cursor.fetchone()[0])
def test_upgrade_2_to_3(self):
# Setup test db with example entries covering - hopefully - all cases
self._initialize_db(2)
cursor: sqlite3.Cursor = self.db._sqlite_db.cursor()
cursor.execute('''
INSERT INTO users VALUES
(1, 'testadmin', 'a@b.c', '$2a$10$herebehashes', NULL, 1, 1, 1337, 0),
(2, 'testuser', NULL, '$2a$10$herebehashes', '$2a$10$herebehashes', 0, 1, 4242, 0),
(3, 'alien', NULL, '$2a$10$herebehashes', '$2a$10$herebehashes', 0, 0, 1234, 0),
(4, 'neverused', NULL, '$2a$10$herebehashes', '$2a$10$herebehashes', 0, 0, 1234, 1234)
''')
cursor.execute('''
INSERT INTO products VALUES
(1, 'Club Mate', 42, 200, 250),
(2, 'Flora Power Mate', 10, 100, 150)
''')
cursor.execute('''
INSERT INTO transactions VALUES
(1, 1, 4200, 0, 1000), -- deposit
(2, 2, 1337, 0, 1001), -- modification
(3, 3, 1337, 0, 1002), -- modification with deleted agent
(4, 2, -200, 1337, 1003), -- consumption
(5, 3, -200, 1337, 1004) -- consumption with deleted product
''')
cursor.execute('''INSERT INTO deposits VALUES (1)''')
cursor.execute('''
INSERT INTO modifications VALUES
(2, 1, 'Account migration'),
(3, 42, 'You can''t find out who i am... MUAHAHAHA!!!')''')
cursor.execute('''INSERT INTO consumptions VALUES (4, 2), (5, 42)''')
cursor.execute('''PRAGMA user_version = 2''')
# Kick off the migration
schema_version = self.db.SCHEMA_VERSION
self.db.SCHEMA_VERSION = 3
self.db._setup()
self.db.SCHEMA_VERSION = schema_version
# Make sure the receipts table was created
cursor.execute('''SELECT COUNT(receipt_id) FROM receipts''')
self.assertEqual(0, cursor.fetchone()[0])
# Make sure users.created was populated with the expected values
cursor.execute('''SELECT u.created FROM users AS u ORDER BY u.user_id ASC''')
self.assertEqual([(940,), (941,), (942,), (1174,)], cursor.fetchall())
# Make sure the modifications table was changed to contain the username, or a fallback
cursor.execute('''SELECT agent FROM modifications WHERE ta_id = 2''')
self.assertEqual('testadmin', cursor.fetchone()[0])
cursor.execute('''SELECT agent FROM modifications WHERE ta_id = 3''')
self.assertEqual('<unknown>', cursor.fetchone()[0])
# Make sure the consumptions table was changed to contain the product name, or a fallback
cursor.execute('''SELECT product FROM consumptions WHERE ta_id = 4''')
self.assertEqual('Flora Power Mate', cursor.fetchone()[0])
cursor.execute('''SELECT product FROM consumptions WHERE ta_id = 5''')
self.assertEqual('<unknown>', cursor.fetchone()[0])
def test_upgrade_3_to_4(self):
# Setup test db with example entries to test schema change
self._initialize_db(3)
cursor: sqlite3.Cursor = self.db._sqlite_db.cursor()
cursor.execute('''
INSERT INTO users VALUES
(1, 'testadmin', 'a@b.c', '$2a$10$herebehashes', NULL, 1, 1, 1337, 0, 0, 0)
''')
cursor.execute('''
INSERT INTO products VALUES
(1, 'Club Mate', 42, 200, 250)
''')
cursor.execute('''
INSERT INTO transactions VALUES (1, 1, 4200, 0, 1000)
''')
cursor.execute('''
INSERT INTO receipts VALUES (1, 1, 1, 1, 1337)
''')
cursor.execute('PRAGMA user_version = 3')
# Kick off the migration
schema_version = self.db.SCHEMA_VERSION
self.db.SCHEMA_VERSION = 4
self.db._setup()
self.db.SCHEMA_VERSION = schema_version
# Make sure entries from the receipts table are preserved
cursor.execute('''SELECT COUNT(receipt_id) FROM receipts''')
self.assertEqual(1, cursor.fetchone()[0])
# Make sure transaction IDs can be set to NULL
cursor.execute('UPDATE receipts SET first_ta_id = NULL, last_ta_id = NULL')

2
matemat/db/test/test_wrapper.py
View file

@ -17,7 +17,7 @@ class DatabaseTest(unittest.TestCase):
Test creation of database schema in an empty database
"""
with self.db as db:
self.assertEqual(DatabaseWrapper.SCHEMA_VERSION, db._user_version)
self.assertEqual(db.schema_version, db._user_version)
def test_in_transaction(self) -> None:
"""

55
matemat/db/wrapper.py
View file

@ -1,9 +1,10 @@
from typing import Any, Optional
import sqlite3
from matemat.exceptions import DatabaseConsistencyError
from matemat.db.schemas import SCHEMAS
from matemat.db.migrations import *
import matemat.db.migrations
class DatabaseTransaction(object):
@ -40,8 +41,6 @@ class DatabaseTransaction(object):
class DatabaseWrapper(object):
SCHEMA_VERSION = 10
def __init__(self, filename: str) -> None:
self._filename: str = filename
self._sqlite_db: Optional[sqlite3.Connection] = None
@ -61,16 +60,11 @@ class DatabaseWrapper(object):
def _setup(self) -> None:
# Create or update schemas if necessary
version: int = self._user_version
if version < 1:
# Don't use executescript, as it issues a COMMIT first
with self.transaction() as c:
for command in SCHEMAS[self.SCHEMA_VERSION]:
c.execute(command)
elif version < self.SCHEMA_VERSION:
self._upgrade(from_version=version, to_version=self.SCHEMA_VERSION)
elif version > self.SCHEMA_VERSION:
if version < self.schema_version:
self._upgrade(from_version=version, to_version=self.schema_version)
self._user_version = self.schema_version
elif version > self.schema_version:
raise RuntimeError('Database schema is newer than supported by this version of Matemat.')
self._user_version = self.SCHEMA_VERSION
# Enable foreign key enforcement
cursor = self._sqlite_db.cursor()
@ -79,35 +73,20 @@ class DatabaseWrapper(object):
def _upgrade(self, from_version: int, to_version: int) -> None:
if from_version >= to_version:
return
# Create backup before migration
if self._filename != ':memory:':
bakfile = f'{self._filename}_{from_version}_{to_version}.bak'
bak = sqlite3.connect(bakfile)
with bak:
self._sqlite_db.backup(bak, pages=1)
bak.close()
# Iterate through migrations, executing them one by one
with self.transaction() as c:
c.execute('PRAGMA foreign_keys=OFF')
c.execute('PRAGMA legacy_alter_table=ON')
if from_version <= 1 and to_version >= 2:
migrate_schema_1_to_2(c)
if from_version <= 2 and to_version >= 3:
migrate_schema_2_to_3(c)
if from_version <= 3 and to_version >= 4:
migrate_schema_3_to_4(c)
if from_version <= 4 and to_version >= 5:
migrate_schema_4_to_5(c)
if from_version <= 5 and to_version >= 6:
migrate_schema_5_to_6(c)
if from_version <= 6 and to_version >= 7:
migrate_schema_6_to_7(c)
if from_version <= 7 and to_version >= 8:
migrate_schema_7_to_8(c)
if from_version <= 7 and to_version >= 8:
migrate_schema_7_to_8(c)
if from_version <= 8 and to_version >= 9:
migrate_schema_8_to_9(c)
if from_version <= 9 and to_version >= 10:
migrate_schema_9_to_10(c)
for i in range(from_version+1, to_version+1):
migration = getattr(matemat.db.migrations, f'migrate_schema_{i}')
migration(c)
c.execute('PRAGMA foreign_key_check')
c.execute('PRAGMA foreign_keys=ON')
@ -146,3 +125,13 @@ class DatabaseWrapper(object):
raise RuntimeError(f'Database connection to {self._filename} is not established.')
cursor = self._sqlite_db.cursor()
cursor.execute(f'PRAGMA user_version = {version}')
@property
def schema_version(self) -> int:
max_migration = 0
for name in dir(matemat.db.migrations):
if not name.startswith('migrate_schema_'):
continue
migration = int(name.split('_')[2])
max_migration = max(max_migration, migration)
return max_migration