fix(db): add additional connection pool for projection spooling (#7094)

* fix(db): add additional connection pool for projection spooling

* use correct connection pool for projections

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/database/database.go

@@ -17,9 +17,10 @@ import (
 )
 
 type Config struct {
-	Dialects           map[string]interface{} `mapstructure:",remain"`
-	EventPushConnRatio float32
-	connector          dialect.Connector
+	Dialects                   map[string]interface{} `mapstructure:",remain"`
+	EventPushConnRatio         float64
+	ProjectionSpoolerConnRatio float64
+	connector                  dialect.Connector
 }
 
 func (c *Config) SetConnector(connector dialect.Connector) {
@@ -109,18 +110,8 @@ func QueryJSONObject[T any](ctx context.Context, db *DB, query string, args ...a
 	return obj, nil
 }
 
-const (
-	zitadelAppName          = "zitadel"
-	EventstorePusherAppName = "zitadel_es_pusher"
-)
-
-func Connect(config Config, useAdmin, isEventPusher bool) (*DB, error) {
-	appName := zitadelAppName
-	if isEventPusher {
-		appName = EventstorePusherAppName
-	}
-
-	client, err := config.connector.Connect(useAdmin, isEventPusher, config.EventPushConnRatio, appName)
+func Connect(config Config, useAdmin bool, purpose dialect.DBPurpose) (*DB, error) {
+	client, err := config.connector.Connect(useAdmin, config.EventPushConnRatio, config.ProjectionSpoolerConnRatio, purpose)
 	if err != nil {
 		return nil, err
 	}