create dbinfo and schema handler

This will allow to update databases incrementally in the future

core/__init__.py

@@ -3,3 +3,4 @@
 from .migration import *
 from .database import *
 from .github import *
+from .schema import *

core/database.py

@@ -25,24 +25,29 @@
 
 import sqlite3
 from random import randint
+from . import schema
 
 
 def initialize(database):
     conn = sqlite3.connect(database)
     cursor = conn.cursor()
     cursor.execute(
         "CREATE TABLE IF NOT EXISTS 'messages' ('message_id' INT, 'channel' INT,"
-        " 'reactionrole_id' INT);"
+        " 'reactionrole_id' INT, 'guild_id' INT);"
     )
     cursor.execute(
         "CREATE TABLE IF NOT EXISTS 'reactionroles' ('reactionrole_id' INT, 'reaction'"
         " NVCARCHAR, 'role_id' INT);"
     )
     cursor.execute("CREATE TABLE IF NOT EXISTS 'admins' ('role_id' INT);")
+    cursor.execute("CREATE TABLE IF NOT EXISTS 'dbinfo' ('version' INT);")
     conn.commit()
     cursor.close()
     conn.close()
 
+    updater = schema.SchemaHandler(database)
+    updater.update()
+
 
 class ReactionRoleCreationTracker:
     def __init__(self, user, channel, database):
@@ -63,7 +68,7 @@ def _generate_reactionrole_id(self):
             self.reactionrole_id = randint(0, 100000)
             cursor = conn.cursor()
             cursor.execute(
-                "SELECT * FROM messages WHERE reactionrole_id = ?",
+                "SELECT * FROM messages WHERE reactionrole_id = ?;",
                 (self.reactionrole_id,),
             )
             already_exists = cursor.fetchall()
@@ -218,7 +223,7 @@ def fetch_all_messages(self):
         try:
             conn = sqlite3.connect(self.database)
             cursor = conn.cursor()
-            cursor.execute(f"SELECT message_id, channel FROM messages;")
+            cursor.execute("SELECT message_id, channel FROM messages;")
             all_messages = {}
             for row in cursor:
                 message_id = int(row[0])