id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
1219385669,I_kwDOBm6k_c5IrllF,1729,Implement ?_extra and new API design for TableView,9599,open,0,,8755003,12,2022-04-28T22:28:14Z,2022-12-13T05:29:07Z,,OWNER,,"Part of:
- #262
- #1518",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1729/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,
1219398983,I_kwDOBm6k_c5Iro1H,1730,SQL tracing should much more closely track the SQL query execution,9599,open,0,,,0,2022-04-28T22:41:04Z,2022-04-28T22:41:10Z,,OWNER,,"In #1727 I realized that the SQL tracing was measuring a whole bunch of stuff outside of the SQL query itself.

I started experimenting with this fix for that but it didn't work - I got back an empty JSON array of traces for some reason:

```diff
diff --git a/datasette/database.py b/datasette/database.py
index ba594a8..d7f9172 100644
--- a/datasette/database.py
+++ b/datasette/database.py
@@ -7,7 +7,7 @@ import sys
 import threading
 import uuid
 
-from .tracer import trace
+from .tracer import trace, trace_child_tasks
 from .utils import (
     detect_fts,
     detect_primary_keys,
@@ -207,30 +207,31 @@ class Database:
                 time_limit_ms = custom_time_limit
 
             with sqlite_timelimit(conn, time_limit_ms):
-                try:
-                    cursor = conn.cursor()
-                    cursor.execute(sql, params if params is not None else {})
-                    max_returned_rows = self.ds.max_returned_rows
-                    if max_returned_rows == page_size:
-                        max_returned_rows += 1
-                    if max_returned_rows and truncate:
-                        rows = cursor.fetchmany(max_returned_rows + 1)
-                        truncated = len(rows) > max_returned_rows
-                        rows = rows[:max_returned_rows]
-                    else:
-                        rows = cursor.fetchall()
-                        truncated = False
-                except (sqlite3.OperationalError, sqlite3.DatabaseError) as e:
-                    if e.args == (""interrupted"",):
-                        raise QueryInterrupted(e, sql, params)
-                    if log_sql_errors:
-                        sys.stderr.write(
-                            ""ERROR: conn={}, sql = {}, params = {}: {}\n"".format(
-                                conn, repr(sql), params, e
+                with trace(""sql"", database=self.name, sql=sql.strip(), params=params):
+                    try:
+                        cursor = conn.cursor()
+                        cursor.execute(sql, params if params is not None else {})
+                        max_returned_rows = self.ds.max_returned_rows
+                        if max_returned_rows == page_size:
+                            max_returned_rows += 1
+                        if max_returned_rows and truncate:
+                            rows = cursor.fetchmany(max_returned_rows + 1)
+                            truncated = len(rows) > max_returned_rows
+                            rows = rows[:max_returned_rows]
+                        else:
+                            rows = cursor.fetchall()
+                            truncated = False
+                    except (sqlite3.OperationalError, sqlite3.DatabaseError) as e:
+                        if e.args == (""interrupted"",):
+                            raise QueryInterrupted(e, sql, params)
+                        if log_sql_errors:
+                            sys.stderr.write(
+                                ""ERROR: conn={}, sql = {}, params = {}: {}\n"".format(
+                                    conn, repr(sql), params, e
+                                )
                             )
-                        )
-                        sys.stderr.flush()
-                    raise
+                            sys.stderr.flush()
+                        raise
 
             if truncate:
                 return Results(rows, truncated, cursor.description)
@@ -238,9 +239,8 @@ class Database:
             else:
                 return Results(rows, False, cursor.description)
 
-        with trace(""sql"", database=self.name, sql=sql.strip(), params=params):
-            results = await self.execute_fn(sql_operation_in_thread)
-        return results
+        with trace_child_tasks():
+            return await self.execute_fn(sql_operation_in_thread)
 
     @property
     def size(self):
```

_Originally posted by @simonw in https://github.com/simonw/datasette/issues/1727#issuecomment-1111602802_",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1730/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,