diff --git a/backend/go.mod b/backend/go.mod
index baad80f..6964dc1 100644
--- a/backend/go.mod
+++ b/backend/go.mod
@@ -5,6 +5,7 @@ go 1.16
 require (
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/pelletier/go-toml/v2 v2.0.0-beta.3
+	github.com/satori/go.uuid v1.2.0
 	gorm.io/driver/mysql v1.1.2
 	gorm.io/gorm v1.21.13
 )
diff --git a/backend/go.sum b/backend/go.sum
index 5e71c6a..8bd59e9 100644
--- a/backend/go.sum
+++ b/backend/go.sum
@@ -12,9 +12,12 @@ github.com/pelletier/go-toml/v2 v2.0.0-beta.3 h1:PNCTU4naEJ8mKal97P3A2qDU74QRQGl
 github.com/pelletier/go-toml/v2 v2.0.0-beta.3/go.mod h1:aNseLYu/uKskg0zpr/kbr2z8yGuWtotWf/0BpGIAL2Y=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/satori/go.uuid v1.2.0 h1:0uYX9dsZ2yD7q2RtLRtPSdGDWzjeM3TbMJP9utgA0ww=
+github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.7.1-0.20210427113832-6241f9ab9942 h1:t0lM6y/M5IiUZyvbBTcngso8SZEZICH7is9B6g/obVU=
 github.com/stretchr/testify v1.7.1-0.20210427113832-6241f9ab9942/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/backend/internal/data/gorm.go b/backend/internal/data/gorm.go
index 5196900..7ac8ddd 100644
--- a/backend/internal/data/gorm.go
+++ b/backend/internal/data/gorm.go
@@ -5,6 +5,7 @@ import (
 	"gorm.io/driver/mysql"
 	"gorm.io/gorm"
 	"strings"
+	"threadule/backend/internal/data/models"
 )
 
 func connect(dsn string) (*gorm.DB, error) {
@@ -14,7 +15,11 @@ func connect(dsn string) (*gorm.DB, error) {
 func migrate(db *gorm.DB) error {
 	var errs []error
 
-	//errs = append(errs, db.AutoMigrate())
+	errs = append(errs, db.AutoMigrate(&models.Group{}))
+	errs = append(errs, db.AutoMigrate(&models.User{}))
+	errs = append(errs, db.AutoMigrate(&models.Account{}))
+	errs = append(errs, db.AutoMigrate(&models.Tweet{}))
+	errs = append(errs, db.AutoMigrate(&models.Thread{}))
 
 	errorBuilder := strings.Builder{}
 	for _, err := range errs {
diff --git a/backend/internal/data/models/account.go b/backend/internal/data/models/account.go
new file mode 100644
index 0000000..84e56e7
--- /dev/null
+++ b/backend/internal/data/models/account.go
@@ -0,0 +1,13 @@
+package models
+
+import uuid "github.com/satori/go.uuid"
+
+type Account struct {
+	BaseModel
+	UserID uuid.UUID
+	User   *User
+
+	Name              string
+	AccessToken       *string
+	AccessTokenSecret *string
+}
diff --git a/backend/internal/data/models/base.go b/backend/internal/data/models/base.go
new file mode 100644
index 0000000..a165c43
--- /dev/null
+++ b/backend/internal/data/models/base.go
@@ -0,0 +1,19 @@
+package models
+
+import (
+	"github.com/satori/go.uuid"
+	"gorm.io/gorm"
+	"time"
+)
+
+type BaseModel struct {
+	ID        uuid.UUID `gorm:"type:uuid;primary_key;"`
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	DeletedAt gorm.DeletedAt `gorm:"index"`
+}
+
+func (b *BaseModel) BeforeCreate(_ *gorm.DB) error {
+	b.ID = uuid.NewV4()
+	return nil
+}
diff --git a/backend/internal/data/models/group.go b/backend/internal/data/models/group.go
new file mode 100644
index 0000000..da05986
--- /dev/null
+++ b/backend/internal/data/models/group.go
@@ -0,0 +1,13 @@
+package models
+
+type Group struct {
+	BaseModel
+	Users []*User `gorm:"many2many:user_groups;"`
+
+	Name        string
+	DisplayName string
+
+	LimitAccounts uint
+	LimitThreads  uint
+	LimitTweets   uint
+}
diff --git a/backend/internal/data/models/thread.go b/backend/internal/data/models/thread.go
new file mode 100644
index 0000000..a1ca0c0
--- /dev/null
+++ b/backend/internal/data/models/thread.go
@@ -0,0 +1,16 @@
+package models
+
+import (
+	uuid "github.com/satori/go.uuid"
+	"time"
+)
+
+type Thread struct {
+	BaseModel
+	AccountID uuid.UUID
+	Account   *Account
+	Tweets    []Tweet
+
+	Sent         bool
+	ScheduledFor time.Time
+}
diff --git a/backend/internal/data/models/tweet.go b/backend/internal/data/models/tweet.go
new file mode 100644
index 0000000..af0808f
--- /dev/null
+++ b/backend/internal/data/models/tweet.go
@@ -0,0 +1,12 @@
+package models
+
+import uuid "github.com/satori/go.uuid"
+
+type Tweet struct {
+	BaseModel
+	ThreadID uuid.UUID
+
+	TweetID *string
+	Text    string
+	Sent    bool
+}
diff --git a/backend/internal/data/models/user.go b/backend/internal/data/models/user.go
new file mode 100644
index 0000000..865d85e
--- /dev/null
+++ b/backend/internal/data/models/user.go
@@ -0,0 +1,9 @@
+package models
+
+type User struct {
+	BaseModel
+	Groups []*Group `gorm:"many2many:user_groups;"`
+
+	Username string
+	Password string
+}