quotes: add quote searching

bot/utils.py

@@ -12,6 +12,10 @@ def date_from_iso(date: str) -> datetime:
     return datetime.strptime(date, '%Y-%m-%dT%H:%M:%S.%fZ')
 
 
+def is_int(val: str) -> bool:
+    return val.isdigit() or (val.startswith('+') or val.startswith('-')) and val[1:].isdigit()
+
+
 def parse_int(val: str, select: bool = True) -> Tuple[int, str]:
     try:
         val = int(val)