Database: allow mysql, config in ini file

Also check for ini file existence at startup

models.py

@@ -1,11 +1,24 @@
+from config import conf
 from peewee import SqliteDatabase
 from peewee import Model
 from peewee import AutoField, DateField, IntegerField
 
 from peewee import IntegrityError
 
-# SQLite database
-db = SqliteDatabase("fioul.db")
+backend = conf["db"].get("backend", None)
+if backend == "sqlite":
+    # SQLite database
+    db = SqliteDatabase(conf["sqlite"].get("filename", "sqlite.db"))
+elif backend == "mysql":
+    db = MySQLDatabase(
+        conf["mysql"].get("database"),
+        user=conf["mysql"].get("user"),
+        password=conf["mysql"].get("password"),
+        host=conf["mysql"].get("host", "localhost"),
+        port=conf["mysql"].getint("port", 3306),
+    )
+else:
+    db = None
 
 
 class BaseModel(Model):