diff --git a/main.go b/main.go
index a0daf7e..3e9c46a 100644
--- a/main.go
+++ b/main.go
@@ -8,6 +8,7 @@ import (
 
 	_ "github.com/go-sql-driver/mysql"
 	_ "github.com/jinzhu/gorm/dialects/mysql"
+	_ "github.com/jinzhu/gorm/dialects/postgres"
 	_ "github.com/jinzhu/gorm/dialects/sqlite"
 	"github.com/urfave/cli"
 	"moul.io/srand"
diff --git a/pkg/bastion/dbinit.go b/pkg/bastion/dbinit.go
index 338d50b..3cab6f7 100644
--- a/pkg/bastion/dbinit.go
+++ b/pkg/bastion/dbinit.go
@@ -45,8 +45,8 @@ func DBInit(db *gorm.DB) error {
 					Type        string
 					Length      uint
 					Fingerprint string
-					PrivKey     string           `sql:"size:10000"`
-					PubKey      string           `sql:"size:10000"`
+					PrivKey     string           `sql:"size:5000"`
+					PubKey      string           `sql:"size:1000"`
 					Hosts       []*dbmodels.Host `gorm:"ForeignKey:SSHKeyID"`
 					Comment     string
 				}
@@ -80,7 +80,7 @@ func DBInit(db *gorm.DB) error {
 			Migrate: func(tx *gorm.DB) error {
 				type UserKey struct {
 					gorm.Model
-					Key     []byte         `sql:"size:10000"`
+					Key     []byte         `sql:"size:1000"`
 					UserID  uint           ``
 					User    *dbmodels.User `gorm:"ForeignKey:UserID"`
 					Comment string
@@ -341,8 +341,8 @@ func DBInit(db *gorm.DB) error {
 			Migrate: func(tx *gorm.DB) error {
 				type UserKey struct {
 					gorm.Model
-					Key           []byte         `sql:"size:10000" valid:"required,length(1|10000)"`
-					AuthorizedKey string         `sql:"size:10000" valid:"required,length(1|10000)"`
+					Key           []byte         `sql:"size:1000" valid:"required,length(1|1000)"`
+					AuthorizedKey string         `sql:"size:1000" valid:"required,length(1|1000)"`
 					UserID        uint           ``
 					User          *dbmodels.User `gorm:"ForeignKey:UserID"`
 					Comment       string         `valid:"optional"`
@@ -386,7 +386,7 @@ func DBInit(db *gorm.DB) error {
 					Password    string                `valid:"optional"`
 					SSHKey      *dbmodels.SSHKey      `gorm:"ForeignKey:SSHKeyID"`
 					SSHKeyID    uint                  `gorm:"index"`
-					HostKey     []byte                `sql:"size:10000" valid:"optional"`
+					HostKey     []byte                `sql:"size:1000" valid:"optional"`
 					Groups      []*dbmodels.HostGroup `gorm:"many2many:host_host_groups;"`
 					Fingerprint string                `valid:"optional"`
 					Comment     string                `valid:"optional"`
@@ -447,7 +447,7 @@ func DBInit(db *gorm.DB) error {
 					URL      string
 					SSHKey   *dbmodels.SSHKey      `gorm:"ForeignKey:SSHKeyID"`
 					SSHKeyID uint                  `gorm:"index"`
-					HostKey  []byte                `sql:"size:10000"`
+					HostKey  []byte                `sql:"size:1000"`
 					Groups   []*dbmodels.HostGroup `gorm:"many2many:host_host_groups;"`
 					Comment  string
 				}
@@ -468,7 +468,7 @@ func DBInit(db *gorm.DB) error {
 					URL      string
 					SSHKey   *dbmodels.SSHKey      `gorm:"ForeignKey:SSHKeyID"`
 					SSHKeyID uint                  `gorm:"index"`
-					HostKey  []byte                `sql:"size:10000"`
+					HostKey  []byte                `sql:"size:1000"`
 					Groups   []*dbmodels.HostGroup `gorm:"many2many:host_host_groups;"`
 					Comment  string
 					Hop      *dbmodels.Host
@@ -518,8 +518,8 @@ func DBInit(db *gorm.DB) error {
 					Action      string                `valid:"required"`
 					Weight      uint                  ``
 					Comment     string                `valid:"optional"`
-					Inception   *time.Time            `gorm:"type:datetime"`
-					Expiration  *time.Time            `gorm:"type:datetime"`
+					Inception   *time.Time
+					Expiration  *time.Time
 				}
 				return tx.AutoMigrate(&ACL{}).Error
 			},
diff --git a/pkg/dbmodels/dbmodels.go b/pkg/dbmodels/dbmodels.go
index e6742f6..e5d6f9e 100644
--- a/pkg/dbmodels/dbmodels.go
+++ b/pkg/dbmodels/dbmodels.go
@@ -42,8 +42,8 @@ type SSHKey struct {
 	Type        string  `valid:"required"`
 	Length      uint    `valid:"required"`
 	Fingerprint string  `valid:"optional"`
-	PrivKey     string  `sql:"size:10000" valid:"required"`
-	PubKey      string  `sql:"size:10000" valid:"optional"`
+	PrivKey     string  `sql:"size:5000" valid:"required"`
+	PubKey      string  `sql:"size:1000" valid:"optional"`
 	Hosts       []*Host `gorm:"ForeignKey:SSHKeyID"`
 	Comment     string  `valid:"optional"`
 }
@@ -58,7 +58,7 @@ type Host struct {
 	URL      string       `valid:"optional"`
 	SSHKey   *SSHKey      `gorm:"ForeignKey:SSHKeyID"` // SSHKey used to connect by the client
 	SSHKeyID uint         `gorm:"index"`
-	HostKey  []byte       `sql:"size:10000" valid:"optional"`
+	HostKey  []byte       `sql:"size:1000" valid:"optional"`
 	Groups   []*HostGroup `gorm:"many2many:host_host_groups;"`
 	Comment  string       `valid:"optional"`
 	Logging  string       `valid:"optional,host_logging_mode"`
@@ -69,8 +69,8 @@ type Host struct {
 // UserKey defines a user public key used by sshportal to identify the user
 type UserKey struct {
 	gorm.Model
-	Key           []byte `sql:"size:10000" valid:"length(1|10000)"`
-	AuthorizedKey string `sql:"size:10000" valid:"required,length(1|10000)"`
+	Key           []byte `sql:"size:1000" valid:"length(1|1000)"`
+	AuthorizedKey string `sql:"size:1000" valid:"required,length(1|1000)"`
 	UserID        uint   ``
 	User          *User  `gorm:"ForeignKey:UserID"`
 	Comment       string `valid:"optional"`