diff --git a/main.py b/main.py
index 0bfbc96..0c7b9b5 100644
--- a/main.py
+++ b/main.py
@@ -11,11 +11,12 @@ import random
 import subprocess
 from asyncio import Lock
 from datetime import date, datetime, time, timedelta
-from typing import Any, cast
+from typing import Any, TypedDict, cast
 
 import nicolib
 import queries_to_answers as q2a
 from nicolib import VideoInfo
+from nizika_ai.config import DB
 from nizika_ai.consts import Character, GPTModel, QueryType
 from nizika_ai.models import Query
 
@@ -45,7 +46,8 @@ async def main (
             report_nico (),
             update_kiriban_list (),
             report_snack_time (),
-            report_hot_spring_time ())
+            report_hot_spring_time (),
+            reconnect_db ())
 
 
 async def queries_to_answers (
@@ -92,7 +94,7 @@ async def report_kiriban (
         if comments:
             prompt += f"人気のコメントは次の通りです：「{ '」、「'.join (c['content'] for c in popular_comments) }」\n"
             if latest_comments != popular_comments:
-                prompt += f"最新のコメントは次の通りです：「{ '」、「'.join (c.content for c in latest_comments) }」\n"
+                prompt += f"最新のコメントは次の通りです：「{ '」、「'.join (c['content'] for c in latest_comments) }」\n"
         prompt += f"""
 概要には次のように書かれています：
 ```html
@@ -156,16 +158,17 @@ def fetch_kiriban_list (
     """
 
     result = subprocess.run (
-            ['python3', str (base_date), *map (str, KIRABAN_VIEWS_COUNTS)],
+            ['python3', '/root/nizika_nico/get_kiriban_list.py',
+             str (base_date), *map (str, KIRIBAN_VIEWS_COUNTS)],
             cwd             = '/root/nizika_nico',
             env             = os.environ,
             capture_output  = True,
             text            = True)
     kl: list[list[int | str]] = json.loads (result.stdout)
 
-    return map (lambda k: (cast (int, k[0]),
-                           nicolib.fetch_video_info (cast (str, k[1])),
-                           datetime.strptime (cast (str, k[2]), '%Y-%m-%d %H:%M:%S.%f')), kl)
+    return [(cast (int, k[0]), video_info, str_to_datetime (cast (str, k[2])))
+            for k in kl
+            if (video_info := nicolib.fetch_video_info (cast (str, k[1]))) is not None]
 
 
 def fetch_comments (
@@ -186,15 +189,15 @@ def fetch_comments (
     """
 
     result = subprocess.run (
-            ['python3', video_code],
+            ['python3', 'get_comments_by_video_code.py', video_code],
             cwd             = '/root/nizika_nico',
             env             = os.environ,
             capture_output  = True,
             text            = True)
     rows: list[dict[str, Any]] = json.loads (result.stdout)
     comments: list[CommentDict] = []
-    for row in comments:
-        row['posted_at'] = datetime.strptime (row['posted_at'], '%Y-%m-%d %H:%M:%S.%f')
+    for row in rows:
+        row['posted_at'] = str_to_datetime (row['posted_at'])
         comments.append (cast (CommentDict, row))
 
     return comments
@@ -281,6 +284,19 @@ async def report_hot_spring_time (
         _add_query ('温泉に入ろう!!!', QueryType.HOT_SPRING)
 
 
+async def reconnect_db (
+) -> None:
+    while True:
+        await asyncio.sleep (1800)
+        try:
+            DB.reconnect ('mysql')
+        except Exception as e:
+            if getattr (e, 'args', [None])[0] == 2006:
+                print ('堕ちたな（確信）．')
+            else:
+                raise
+
+
 def _add_query (
         content:        str,
         query_type:     QueryType,
@@ -291,7 +307,7 @@ def _add_query (
     query.target_character = Character.DEERJIKA.value
     query.content = content
     query.query_type = query_type.value
-    query.model = GPTModel.GPT3_TURBO.value
+    query.model = GPTModel.GPT4_O.value
     query.sent_at = datetime.now ()
     query.answered = False
     query.transfer_data = transfer_data
@@ -324,6 +340,20 @@ def _format_elapsed (
     return f"{ days }日{ hours }時間{ mins }分{ seconds }秒"
 
 
+def str_to_datetime (
+        s:  str,
+) -> datetime:
+    formats: list[str] = [
+            '%Y-%m-%d %H:%M:%S.%f',
+            '%Y-%m-%d %H:%M:%S']
+    for f in formats:
+        try:
+            return datetime.strptime (s, f)
+        except ValueError:
+            pass
+    raise ValueError ('うんち!w')
+
+
 class CommentDict (TypedDict):
     id:         int
     video_id:   int
diff --git a/nicolib b/nicolib
index 32ecf2d..8567098 160000
--- a/nicolib
+++ b/nicolib
@@ -1 +1 @@
-Subproject commit 32ecf2d00fcba876ed5afe48626058b2b4795399
+Subproject commit 85670982f0cd84b3127219dcb1d9ec8efe072aea
diff --git a/nizika_ai b/nizika_ai
index 3be6d90..5dae2ae 160000
--- a/nizika_ai
+++ b/nizika_ai
@@ -1 +1 @@
-Subproject commit 3be6d9063c987deaceee24a1d16296d21319778c
+Subproject commit 5dae2ae038e1109f3c70d853d2b7dd7542e5e88e
diff --git a/queries_to_answers.py b/queries_to_answers.py
index cd9d96f..0950c05 100644
--- a/queries_to_answers.py
+++ b/queries_to_answers.py
@@ -84,6 +84,7 @@ def add_answer (
     answer.content = Talk.main (message, user_name, histories,
                                 goatoh_mode = character == Character.GOATOH)
     answer.sent_at = datetime.now ()
+    answer.answer_type = query.query_type
     answer.save ()
     add_answered_flags (answer)
 
@@ -102,7 +103,7 @@ def add_answered_flags (
 
     answer_type: QueryType
     try:
-        answer_type = QueryType (answer.query_ref.query_type)
+        answer_type = QueryType (answer.query_rel.query_type)
     except (TypeError, ValueError):
         return