table.has_counts_triggers property, refs #219

sqlite_utils/cli.py

@@ -571,6 +571,20 @@ def enable_counts(path, tables, load_extension):
             db[table].enable_counts()
 
 
+@cli.command(name="reset-counts")
+@click.argument(
+    "path",
+    type=click.Path(exists=True, file_okay=True, dir_okay=False, allow_dash=False),
+    required=True,
+)
+@load_extension_option
+def reset_counts(path, load_extension):
+    "Reset calculated counts in the _counts table"
+    db = sqlite_utils.Database(path)
+    _load_extensions(db, load_extension)
+    db.reset_counts()
+
+
 def insert_upsert_options(fn):
     for decorator in reversed(
         (

sqlite_utils/db.py

@@ -1268,6 +1268,16 @@ class Table(Queryable):
             self.db.conn.executescript(sql)
         self.db.use_counts_table = True
 
+    @property
+    def has_counts_triggers(self):
+        trigger_names = {
+            "{table}{counts_table}_{suffix}".format(
+                counts_table=self.db._counts_table_name, table=self.name, suffix=suffix
+            )
+            for suffix in ["insert", "delete"]
+        }
+        return trigger_names.issubset(self.triggers_dict.keys())
+
     def enable_fts(
         self,
         columns,