updated db pool limits, added logs VACUUM, updated api docs

core/db_cgo.go

@@ -24,7 +24,7 @@ func connectDB(dbPath string) (*dbx.DB, error) {
 	// use a fixed connection pool to limit the SQLITE_BUSY errors
 	// and reduce the open file descriptors
 	// (the limits are arbitrary and may change in the future)
-	db.DB().SetMaxOpenConns(500)
+	db.DB().SetMaxOpenConns(1000)
 	db.DB().SetMaxIdleConns(30)
 	db.DB().SetConnMaxIdleTime(5 * time.Minute)