X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=plomtask%2Fmisc.py;h=5759c0d8b6bcc5915f84b2e94a533eefa70954e7;hb=8e1a5416151dbcf506f2435823362e21d85aed2d;hp=bf071885278471e421a346791bb9db59989097d5;hpb=34741b65438149b4e02f1e2bb4f8fdba5df5a667;p=plomtask

diff --git a/plomtask/misc.py b/plomtask/misc.py
index bf07188..5759c0d 100644
--- a/plomtask/misc.py
+++ b/plomtask/misc.py
@@ -1,6 +1,7 @@
 """Attributes whose values are recorded as a timestamped history."""
 from datetime import datetime
 from typing import Any
+from sqlite3 import Row
 from plomtask.db import DatabaseConnection
 
 
@@ -32,6 +33,10 @@ class VersionedAttribute:
                 or value != self.history[self._newest_timestamp]:
             self.history[datetime.now().strftime('%Y-%m-%d %H:%M:%S')] = value
 
+    def history_from_row(self, row: Row) -> None:
+        """Extend self.history from expected table row format."""
+        self.history[row[1]] = row[2]
+
     def at(self, queried_time: str) -> str | float:
         """Retrieve value of timestamp nearest queried_time from the past."""
         sorted_timestamps = sorted(self.history.keys())
@@ -46,8 +51,6 @@ class VersionedAttribute:
 
     def save(self, db_conn: DatabaseConnection) -> None:
         """Save as self.history entries, but first wipe old ones."""
-        db_conn.exec(f'DELETE FROM {self.table_name} WHERE parent_id = ?',
-                     (self.parent.id_,))
-        for timestamp, value in self.history.items():
-            db_conn.exec(f'INSERT INTO {self.table_name} VALUES (?, ?, ?)',
-                         (self.parent.id_, timestamp, value))
+        db_conn.rewrite_relations(self.table_name, 'parent', self.parent.id_,
+                                  [[item[0], item[1]]
+                                   for item in self.history.items()])