[#875] reordered the busy_timeout pragma and added a fixed/capped connections pool for the nocgo sqlite driver

core/db_cgo.go

@@ -10,7 +10,10 @@ import (
 )
 
 func connectDB(dbPath string) (*dbx.DB, error) {
-	pragmas := "_foreign_keys=1&_journal_mode=WAL&_synchronous=NORMAL&_busy_timeout=8000"
+	// note: the busy_timeout pragma must be first because
+	// the connection needs to be set to block on busy before WAL mode
+	// is set in case it hasn't been already set by another connection
+	pragmas := "_busy_timeout=10000&_journal_mode=WAL&_foreign_keys=1&_synchronous=NORMAL"
 
 	db, openErr := dbx.MustOpen("sqlite3", fmt.Sprintf("%s?%s", dbPath, pragmas))
 	if openErr != nil {