tweak db settings slightly (#238)

internal/db/bundb/bundb.go

@@ -27,6 +27,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"runtime"
 	"strings"
 	"time"
 
@@ -116,6 +117,7 @@ func NewBunDBService(ctx context.Context, c *config.Config, log *logrus.Logger)
 			return nil, fmt.Errorf("could not create bundb postgres options: %s", err)
 		}
 		sqldb = stdlib.OpenDB(*opts)
+		tweakConnectionValues(sqldb)
 		conn = WrapDBConn(bun.NewDB(sqldb, pgdialect.New()), log)
 	case dbTypeSqlite:
 		// SQLITE
@@ -133,6 +135,7 @@ func NewBunDBService(ctx context.Context, c *config.Config, log *logrus.Logger)
 		if err != nil {
 			return nil, fmt.Errorf("could not open sqlite db: %s", err)
 		}
+		tweakConnectionValues(sqldb)
 		conn = WrapDBConn(bun.NewDB(sqldb, sqlitedialect.New()), log)
 
 		if c.DBConfig.Address == "file::memory:?cache=shared" {
@@ -319,10 +322,18 @@ func deriveBunDBPGOptions(c *config.Config) (*pgx.ConnConfig, error) {
 	cfg.TLSConfig = tlsConfig
 	cfg.Database = c.DBConfig.Database
 	cfg.PreferSimpleProtocol = true
+	cfg.RuntimeParams["application_name"] = c.ApplicationName
 
 	return cfg, nil
 }
 
+// https://bun.uptrace.dev/postgres/running-bun-in-production.html#database-sql
+func tweakConnectionValues(sqldb *sql.DB) {
+	maxOpenConns := 4 * runtime.GOMAXPROCS(0)
+	sqldb.SetMaxOpenConns(maxOpenConns)
+	sqldb.SetMaxIdleConns(maxOpenConns)
+}
+
 /*
 	CONVERSION FUNCTIONS
 */