feat: add an optional config model for database retries (#477)

* feat: add an optional config model for database retries

* style: tweak naming

* fix: make it a pointer

Author: sarumont

database/model_config.go

@@ -15,6 +15,7 @@ type DatabaseConfig struct {
 	Spanner      *SpannerConfig
 	Postgres     *PostgresConfig
 	DatabaseName string
+	Retries      *RetryConfig
 }
 
 type SpannerConfig struct {
@@ -96,3 +97,9 @@ type ConnectionsConfig struct {
 	MaxLifetime time.Duration
 	MaxIdleTime time.Duration
 }
+
+type RetryConfig struct {
+	MaxAttempts int
+	MinDuration time.Duration
+	MaxDuration time.Duration
+}