fix: scheduling (#3978)

* fix: improve scheduling

* build pre-release

* fix: locker

* fix: user handler and print stack in case of panic in reducer

* chore: remove sentry

* fix: improve handler projection and implement tests

* more tests

* fix: race condition in tests

* Update internal/eventstore/repository/sql/query.go

Co-authored-by: Silvan <silvan.reusser@gmail.com>

* fix: implemented suggested changes

* fix: lock statement

Co-authored-by: Silvan <silvan.reusser@gmail.com>

internal/query/projection/config.go

@@ -5,17 +5,19 @@ import (
 )
 
 type Config struct {
-	RequeueEvery     time.Duration
-	RetryFailedAfter time.Duration
-	MaxFailureCount  uint
-	BulkLimit        uint64
-	Customizations   map[string]CustomConfig
-	MaxIterators     int
+	RequeueEvery        time.Duration
+	RetryFailedAfter    time.Duration
+	MaxFailureCount     uint
+	ConcurrentInstances uint
+	BulkLimit           uint64
+	Customizations      map[string]CustomConfig
+	MaxIterators        int
 }
 
 type CustomConfig struct {
-	RequeueEvery     *time.Duration
-	RetryFailedAfter *time.Duration
-	MaxFailureCount  *uint
-	BulkLimit        *uint64
+	RequeueEvery        *time.Duration
+	RetryFailedAfter    *time.Duration
+	MaxFailureCount     *uint
+	ConcurrentInstances *uint
+	BulkLimit           *uint64
 }