fix(migration): use random() on sqlite

migrations/versions/278bcfb487d3_add_hot_spare_pool.py

@@ -17,12 +17,14 @@ depends_on = None
 
 def upgrade():
     if op.get_context().dialect.name == 'postgresql':
+        random_string = "md5(to_char(NOW(), 'YYYY-MM-DD HH24:MI:SS.US'))"
         on_conflict = " ON CONFLICT (id) DO NOTHING"
     else:
+        random_string = "CAST(RANDOM() AS TEXT)"
         on_conflict = ""
     sql = text(f"""INSERT INTO pool VALUES (
                      -1, 'Hot spares (reserve)', NOW(), NOW(), NULL, 'hotspare', 
-                     md5(to_char(NOW(), 'YYYY-MM-DD HH24:MI:SS.US')), NULL){on_conflict};""")
+                     {random_string}, NULL){on_conflict};""")
     op.execute(sql)