diff --git a/core/kg/go.mod b/core/kg/go.mod
new file mode 100644
index 0000000..20a12f1
--- /dev/null
+++ b/core/kg/go.mod
@@ -0,0 +1,30 @@
+module github.com/giolekva/pcloud/core/kg
+
+go 1.14
+
+require (
+	github.com/Masterminds/squirrel v1.5.0
+	github.com/blang/semver v3.5.1+incompatible // indirect
+	github.com/dyatlov/go-opengraph v0.0.0-20210112100619-dae8665a5b09 // indirect
+	github.com/go-gorp/gorp v2.2.0+incompatible // indirect
+	github.com/go-ldap/ldap v3.0.3+incompatible // indirect
+	github.com/go-redis/redis v6.15.9+incompatible // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/jmoiron/sqlx v1.3.1
+	github.com/mattermost/gorp v2.0.0+incompatible // indirect
+	github.com/mattermost/mattermost-server v5.11.1+incompatible
+	github.com/nicksnyder/go-i18n v1.10.1 // indirect
+	github.com/onsi/ginkgo v1.15.0 // indirect
+	github.com/onsi/gomega v1.10.5 // indirect
+	github.com/pborman/uuid v1.2.1 // indirect
+	github.com/pkg/errors v0.9.1
+	github.com/poy/onpar v1.1.2 // indirect
+	github.com/stretchr/objx v0.3.0 // indirect
+	github.com/ziutek/mymysql v1.5.4 // indirect
+	go.uber.org/zap v1.16.0 // indirect
+	golang.org/x/crypto v0.0.0-20210218145215-b8e89b74b9df // indirect
+	golang.org/x/text v0.3.5 // indirect
+	gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d // indirect
+	gopkg.in/natefinch/lumberjack.v2 v2.0.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
diff --git a/core/kg/go.sum b/core/kg/go.sum
new file mode 100644
index 0000000..ffd130e
--- /dev/null
+++ b/core/kg/go.sum
@@ -0,0 +1,303 @@
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diff --git a/core/kg/model/config.go b/core/kg/model/config.go
new file mode 100644
index 0000000..991ea5d
--- /dev/null
+++ b/core/kg/model/config.go
@@ -0,0 +1,29 @@
+package model
+
+const (
+	databaseDriverPostgres = "postgres"
+	defaultDataSource      = "postgres://user:test@localhost/pcloud_test?sslmode=disable&connect_timeout=10"
+)
+
+type Config struct {
+	SqlSettings SqlSettings
+}
+
+func (c *Config) SetDefaults() {
+	c.SqlSettings.SetDefaults()
+}
+
+type SqlSettings struct {
+	DriverName string `access:"environment,write_restrictable,cloud_restrictable"`
+	DataSource string `access:"environment,write_restrictable,cloud_restrictable"`
+}
+
+func (s *SqlSettings) SetDefaults() {
+	if s.DriverName == "" {
+		s.DriverName = databaseDriverPostgres
+	}
+
+	if s.DataSource == "" {
+		s.DataSource = defaultDataSource
+	}
+}
diff --git a/core/kg/model/user.go b/core/kg/model/user.go
new file mode 100644
index 0000000..4ed6cc8
--- /dev/null
+++ b/core/kg/model/user.go
@@ -0,0 +1,112 @@
+package model
+
+import (
+	"net/mail"
+	"regexp"
+	"strings"
+	"unicode"
+
+	"github.com/pkg/errors"
+)
+
+const (
+	userNameMaxLength  = 64
+	userNameMinLength  = 1
+	userEmailMaxLength = 128
+)
+
+// User contains the details about the user.
+// This struct's serializer methods are auto-generated. If a new field is added/removed,
+// please run make gen-serialized.
+type User struct {
+	ID                 string `json:"id"`
+	CreateAt           int64  `json:"create_at,omitempty"`
+	UpdateAt           int64  `json:"update_at,omitempty"`
+	DeleteAt           int64  `json:"delete_at"`
+	Username           string `json:"username"`
+	Password           string `json:"password,omitempty"`
+	Email              string `json:"email"`
+	EmailVerified      bool   `json:"email_verified,omitempty"`
+	FirstName          string `json:"first_name"`
+	LastName           string `json:"last_name"`
+	LastPasswordUpdate int64  `json:"last_password_update,omitempty"`
+}
+
+// IsValid validates the user and returns an error if it isn't configured
+// correctly.
+func (u *User) IsValid() error {
+	if !isValidID(u.ID) {
+		return invalidUserError("id", "")
+	}
+
+	if u.CreateAt == 0 {
+		return invalidUserError("create_at", u.ID)
+	}
+
+	if u.UpdateAt == 0 {
+		return invalidUserError("update_at", u.ID)
+	}
+
+	if !isValidUsername(u.Username) {
+		return invalidUserError("username", u.ID)
+	}
+
+	if !isValidEmail(u.Email) {
+		return invalidUserError("email", u.ID)
+	}
+
+	return nil
+}
+
+func isValidID(value string) bool {
+	if len(value) != 26 {
+		return false
+	}
+
+	for _, r := range value {
+		if !unicode.IsLetter(r) && !unicode.IsNumber(r) {
+			return false
+		}
+	}
+
+	return true
+}
+
+func invalidUserError(fieldName string, userID string) error {
+	return errors.Errorf("Invalid User field: %s; id: %s", fieldName, userID)
+}
+
+func isValidUsername(s string) bool {
+	if len(s) < userNameMinLength || len(s) > userNameMaxLength {
+		return false
+	}
+
+	validUsernameChars := regexp.MustCompile(`^[a-z0-9\.\-_]+$`)
+	if !validUsernameChars.MatchString(s) {
+		return false
+	}
+
+	return true
+}
+
+func isValidEmail(email string) bool {
+	if len(email) > userEmailMaxLength || email == "" {
+		return false
+	}
+	if !isLower(email) {
+		return false
+	}
+
+	if addr, err := mail.ParseAddress(email); err != nil {
+		return false
+	} else if addr.Name != "" {
+		// mail.ParseAddress accepts input of the form "Billy Bob <billy@example.com>" which we don't allow
+		return false
+	}
+
+	return true
+}
+
+func isLower(s string) bool {
+	return strings.ToLower(s) == s
+}
diff --git a/core/kg/store/sqlstore/store.go b/core/kg/store/sqlstore/store.go
new file mode 100644
index 0000000..3b7a7dd
--- /dev/null
+++ b/core/kg/store/sqlstore/store.go
@@ -0,0 +1,38 @@
+package sqlstore
+
+import (
+	sq "github.com/Masterminds/squirrel"
+	"github.com/giolekva/pcloud/core/kg/model"
+	"github.com/giolekva/pcloud/core/kg/store"
+	"github.com/jmoiron/sqlx"
+)
+
+type SqlStore struct {
+	db       *sqlx.DB
+	stores   SqlStoreStores
+	settings *model.SqlSettings
+}
+
+type SqlStoreStores struct {
+	user store.UserStore
+}
+
+func New(settings model.SqlSettings) *SqlStore {
+	store := &SqlStore{
+		settings: &settings,
+	}
+
+	store.initConnection()
+
+	store.stores.user = newSqlUserStore(store)
+
+	return store
+}
+
+func (ss *SqlStore) initConnection() {
+	ss.db = sqlx.MustConnect(ss.settings.DriverName, ss.settings.DataSource)
+}
+
+func (ss *SqlStore) getQueryBuilder() sq.StatementBuilderType {
+	return sq.StatementBuilder.PlaceholderFormat(sq.Dollar)
+}
diff --git a/core/kg/store/sqlstore/user_store.go b/core/kg/store/sqlstore/user_store.go
new file mode 100644
index 0000000..992d22b
--- /dev/null
+++ b/core/kg/store/sqlstore/user_store.go
@@ -0,0 +1,53 @@
+package sqlstore
+
+import (
+	sq "github.com/Masterminds/squirrel"
+	"github.com/giolekva/pcloud/core/kg/model"
+	"github.com/giolekva/pcloud/core/kg/store"
+)
+
+type SqlUserStore struct {
+	*SqlStore
+
+	// usersQuery is a starting point for all queries that return one or more Users.
+	usersQuery sq.SelectBuilder
+}
+
+func newSqlUserStore(sqlStore *SqlStore) store.UserStore {
+	us := &SqlUserStore{
+		SqlStore: sqlStore,
+	}
+
+	// note: we are providing field names explicitly here to maintain order of columns (needed when using raw queries)
+	us.usersQuery = us.getQueryBuilder().
+		Select("u.ID", "u.CreateAt", "u.UpdateAt", "u.DeleteAt", "u.Username", "u.Password", "u.Email", "u.EmailVerified", "u.FirstName", "u.LastName", "u.LastPasswordUpdate").
+		From("Users u")
+
+	schema := `CREATE TABLE IF NOT EXISTS Users (
+			id VARCHAR(26) PRIMARY KEY,
+			create_at INTEGER,
+			update_at INTEGER,
+			delete_at INTEGER,
+			username VARCHAR(64) UNIQUE,
+			password VARCHAR(128) NULL,
+			email VARCHAR(128) UNIQUE,
+			email_verified BOOL NOT NULL DEFAULT FALSE,
+			first_name VARCHAR(64),
+			last_name VARCHAR(64),
+			last_password_update INTEGER);`
+
+	us.db.MustExec(schema)
+	return us
+}
+
+func (us SqlUserStore) Save(user *model.User) (*model.User, error) {
+	return nil, nil
+}
+
+func (us SqlUserStore) Get(id string) (*model.User, error) {
+	return nil, nil
+}
+
+func (us SqlUserStore) GetAll() ([]*model.User, error) {
+	return nil, nil
+}
diff --git a/core/kg/store/store.go b/core/kg/store/store.go
new file mode 100644
index 0000000..d291e4a
--- /dev/null
+++ b/core/kg/store/store.go
@@ -0,0 +1,15 @@
+package store
+
+import "github.com/giolekva/pcloud/core/kg/model"
+
+// Store interface abstracts away the DB implementation
+type Store interface {
+	User() UserStore
+}
+
+// UserStore .
+type UserStore interface {
+	Save(user *model.User) (*model.User, error)
+	Get(id string) (*model.User, error)
+	GetAll() ([]*model.User, error)
+}