Chore: Attempt to reduce flakiness in integration tests (grafana#97247)

* sqlstore/sqlutil: set sync=OFF for sqlite in tests if wal=true

* testinfra: set max open/idle conn to 2 to match e2e tests

pkg/services/sqlstore/sqlutil/sqlutil.go

@@ -110,7 +110,8 @@ func sqLite3TestDB() (*TestDB, error) {
 
 	ret.ConnStr = "file:" + sqliteDb + "?cache=private&mode=rwc"
 	if os.Getenv("SQLITE_JOURNAL_MODE") != "false" {
-		ret.ConnStr += "&_journal_mode=WAL"
+		// For tests, set sync=OFF for faster commits. Reference: https://www.sqlite.org/pragma.html#pragma_synchronous.
+		ret.ConnStr += "&_journal_mode=WAL&_synchronous=OFF"
 	}
 	ret.Path = sqliteDb
 

pkg/tests/testinfra/testinfra.go

@@ -461,9 +461,14 @@ func CreateGrafDir(t *testing.T, opts ...GrafanaOpts) (string, string) {
 			}
 		}
 	}
-	logSection, err := getOrCreateSection("database")
+
+	dbSection, err := getOrCreateSection("database")
+	require.NoError(t, err)
+	_, err = dbSection.NewKey("query_retries", fmt.Sprintf("%d", queryRetries))
+	require.NoError(t, err)
+	_, err = dbSection.NewKey("max_open_conn", "2")
 	require.NoError(t, err)
-	_, err = logSection.NewKey("query_retries", fmt.Sprintf("%d", queryRetries))
+	_, err = dbSection.NewKey("max_idle_conn", "2")
 	require.NoError(t, err)
 
 	cfgPath := filepath.Join(cfgDir, "test.ini")