Logging with loguru (#708)

* logging

* requirements

* add loguru dependency

* restore it

* add loguru

* set log level in .env file

* remove service fee print

* set log level

* more logging

* more logging

* more logging

* pyament.checking_id

* fix

lnbits/commands.py

@@ -5,6 +5,8 @@ import importlib
 import re
 import os
 
+from loguru import logger
+
 from .db import SQLITE, POSTGRES, COCKROACH
 from .core import db as core_db, migrations as core_migrations
 from .helpers import (
@@ -69,7 +71,7 @@ async def migrate_databases():
             if match:
                 version = int(match.group(1))
                 if version > current_versions.get(db_name, 0):
-                    print(f"running migration {db_name}.{version}")
+                    logger.debug(f"running migration {db_name}.{version}")
                     await migrate(db)
 
                     if db.schema == None:
@@ -110,4 +112,4 @@ async def migrate_databases():
         async with ext_db.connect() as ext_conn:
             await run_migration(ext_conn, ext_migrations)
 
-    print("  ✔️ All migrations done.")
+    logger.info("✔️ All migrations done.")