diff --git a/cmd/certs.go b/cmd/certs.go
index 83f2ac5..d93fe13 100644
--- a/cmd/certs.go
+++ b/cmd/certs.go
@@ -61,7 +61,7 @@ func removeCert(ctx *cli.Context) error {
 
 	for _, domain := range domains {
 		fmt.Printf("Removing domain %s from the database...\n", domain)
-		if err := keyDatabase.Delete([]byte(domain)); err != nil {
+		if err := keyDatabase.Delete(domain); err != nil {
 			return err
 		}
 	}
diff --git a/server/certificates/certificates.go b/server/certificates/certificates.go
index a13215c..f663eba 100644
--- a/server/certificates/certificates.go
+++ b/server/certificates/certificates.go
@@ -193,7 +193,7 @@ func (a AcmeHTTPChallengeProvider) CleanUp(domain, token, _ string) error {
 
 func retrieveCertFromDB(sni, mainDomainSuffix []byte, dnsProvider string, acmeUseRateLimits bool, certDB database.CertDB) (tls.Certificate, bool) {
 	// parse certificate from database
-	res, err := certDB.Get(sni)
+	res, err := certDB.Get(string(sni))
 	if err != nil {
 		panic(err) // TODO: no panic
 	}
@@ -406,7 +406,7 @@ func SetupAcmeConfig(acmeAPI, acmeMail, acmeEabHmac, acmeEabKID string, acmeAcce
 
 func SetupCertificates(mainDomainSuffix []byte, dnsProvider string, acmeConfig *lego.Config, acmeUseRateLimits, enableHTTPServer bool, challengeCache cache.SetGetKey, certDB database.CertDB) error {
 	// getting main cert before ACME account so that we can fail here without hitting rate limits
-	mainCertBytes, err := certDB.Get(mainDomainSuffix)
+	mainCertBytes, err := certDB.Get(string(mainDomainSuffix))
 	if err != nil {
 		return fmt.Errorf("cert database is not working")
 	}
@@ -478,7 +478,7 @@ func MaintainCertDB(ctx context.Context, interval time.Duration, mainDomainSuffi
 
 				tlsCertificates, err := certcrypto.ParsePEMBundle(res.Certificate)
 				if err != nil || !tlsCertificates[0].NotAfter.After(now) {
-					err := certDB.Delete(key)
+					err := certDB.Delete(string(key))
 					if err != nil {
 						log.Printf("[ERROR] Deleting expired certificate for %s failed: %s", string(key), err)
 					} else {
@@ -491,15 +491,15 @@ func MaintainCertDB(ctx context.Context, interval time.Duration, mainDomainSuffi
 		log.Printf("[INFO] Removed %d expired certificates from the database", expiredCertCount)
 
 		// compact the database
-		result, err := certDB.Compact()
+		msg, err := certDB.Compact()
 		if err != nil {
 			log.Printf("[ERROR] Compacting key database failed: %s", err)
 		} else {
-			log.Printf("[INFO] Compacted key database (%+v)", result)
+			log.Printf("[INFO] Compacted key database (%s)", msg)
 		}
 
 		// update main cert
-		res, err := certDB.Get(mainDomainSuffix)
+		res, err := certDB.Get(string(mainDomainSuffix))
 		if err != nil {
 			log.Err(err).Msgf("could not get cert for domain '%s'", mainDomainSuffix)
 		} else if res == nil {
diff --git a/server/database/interface.go b/server/database/interface.go
index 01b9872..3ba3efc 100644
--- a/server/database/interface.go
+++ b/server/database/interface.go
@@ -8,8 +8,8 @@ import (
 type CertDB interface {
 	Close() error
 	Put(name string, cert *certificate.Resource) error
-	Get(name []byte) (*certificate.Resource, error)
-	Delete(key []byte) error
-	Compact() (pogreb.CompactionResult, error)
+	Get(name string) (*certificate.Resource, error)
+	Delete(key string) error
+	Compact() (string, error)
 	Items() *pogreb.ItemIterator
 }
diff --git a/server/database/mock.go b/server/database/mock.go
new file mode 100644
index 0000000..456f1e9
--- /dev/null
+++ b/server/database/mock.go
@@ -0,0 +1,58 @@
+package database
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/OrlovEvgeny/go-mcache"
+	"github.com/akrylysov/pogreb"
+	"github.com/go-acme/lego/v4/certificate"
+)
+
+var _ CertDB = tmpDB{}
+
+type tmpDB struct {
+	ctx    context.Context
+	intern *mcache.CacheDriver
+	ttl    time.Duration
+}
+
+func (p tmpDB) Close() error {
+	_ = p.intern.Close()
+	return nil
+}
+
+func (p tmpDB) Put(name string, cert *certificate.Resource) error {
+	p.intern.Set(name, cert, p.ttl)
+	return nil
+}
+
+func (p tmpDB) Get(name string) (*certificate.Resource, error) {
+	cert, has := p.intern.Get(name)
+	if !has {
+		return nil, fmt.Errorf("cert for '%s' not found", name)
+	}
+	return cert.(*certificate.Resource), nil
+}
+
+func (p tmpDB) Delete(key string) error {
+	p.intern.Remove(key)
+	return nil
+}
+
+func (p tmpDB) Compact() (string, error) {
+	p.intern.Truncate()
+	return "Turncate done", nil
+}
+
+func (p tmpDB) Items() *pogreb.ItemIterator {
+	panic("ItemIterator not implemented for tmpDB")
+}
+
+func NewTmpDB() (CertDB, error) {
+	return &tmpDB{
+		intern: mcache.New(),
+		ttl:    time.Minute,
+	}, nil
+}
diff --git a/server/database/setup.go b/server/database/setup.go
index e48b661..bbcf431 100644
--- a/server/database/setup.go
+++ b/server/database/setup.go
@@ -35,9 +35,9 @@ func (p aDB) Put(name string, cert *certificate.Resource) error {
 	return p.intern.Put([]byte(name), resGob.Bytes())
 }
 
-func (p aDB) Get(name []byte) (*certificate.Resource, error) {
+func (p aDB) Get(name string) (*certificate.Resource, error) {
 	cert := &certificate.Resource{}
-	resBytes, err := p.intern.Get(name)
+	resBytes, err := p.intern.Get([]byte(name))
 	if err != nil {
 		return nil, err
 	}
@@ -50,12 +50,16 @@ func (p aDB) Get(name []byte) (*certificate.Resource, error) {
 	return cert, nil
 }
 
-func (p aDB) Delete(key []byte) error {
-	return p.intern.Delete(key)
+func (p aDB) Delete(key string) error {
+	return p.intern.Delete([]byte(key))
 }
 
-func (p aDB) Compact() (pogreb.CompactionResult, error) {
-	return p.intern.Compact()
+func (p aDB) Compact() (string, error) {
+	result, err := p.intern.Compact()
+	if err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("%+v", result), nil
 }
 
 func (p aDB) Items() *pogreb.ItemIterator {