Fix chall cancel commit (#1359)

* fix challenge cancel commit * change conn lifetime

Author: Hitenjain14

code/go/0chain.net/blobbercore/challenge/challenge.go

@@ -144,7 +144,7 @@ func validateOnValidators(ctx context.Context, c *ChallengeEntity) error {
 zap.Time("created", createdTime),
 zap.Error(err))
 deleteChallenge(c.RoundCreatedAt)
-return err
+return nil
 }
 
 completedValidation := time.Now()

code/go/0chain.net/blobbercore/datastore/postgres.go

@@ -68,8 +68,8 @@ func (store *postgresStore) Open() error {
 
 sqldb.SetMaxIdleConns(100)
 sqldb.SetMaxOpenConns(200)
-sqldb.SetConnMaxLifetime(60 * time.Second)
-sqldb.SetConnMaxIdleTime(60 * time.Second)
+sqldb.SetConnMaxLifetime(20 * time.Minute)
+sqldb.SetConnMaxIdleTime(5 * time.Minute)
 // Enable Logger, show detailed log
 //db.LogMode(true)
 store.db = db