added create.py in db

db/create.py

@@ -0,0 +1,29 @@
+import sqlite3
+
+CREATE_SERVICES_TABLE = '''CREATE TABLE IF NOT EXISTS services (
+service_id INTEGER PRIMARY KEY,
+token TEXT NOT NULL,
+name TEXT NOT NULL,
+description TEXT DEFAULT "Нет описания.",
+representation INTEGER DEFAULT 0,
+by_request INTEGER DEFAULT 0
+);'''
+
+CREATE_NOTIFICATIONS_TABLE = '''CREATE TABLE IF NOT EXISTS notifications ( 
+notification_id INTEGER PRIMARY KEY,
+service_id INTEGER NOT NULL,
+timestamp TEXT NOT NULL,
+content_json TEXT NOT NULL,
+FOREIGN KEY (service_id) REFERENCES services(service_id) 
+ON UPDATE CASCADE ON DELETE CASCADE
+);'''
+
+
+def create_tables_if_not_exists(dbfile: str) -> None:
+    connection = sqlite3.connect(dbfile)
+    cursor = connection.cursor()
+    cursor.execute('PRAGMA foreign_keys=0')
+    cursor.execute(CREATE_SERVICES_TABLE)
+    cursor.execute(CREATE_NOTIFICATIONS_TABLE)
+    connection.commit()
+    connection.close()