add initial space logic/behaviour

internal/model/space.go

@@ -0,0 +1,25 @@
+package model
+
+import "time"
+
+type Role string
+
+const (
+	RoleOwner  Role = "owner"
+	RoleMember Role = "member"
+)
+
+type Space struct {
+	ID        string    `db:"id"`
+	Name      string    `db:"name"`
+	OwnerID   string    `db:"owner_id"`
+	CreatedAt time.Time `db:"created_at"`
+	UpdatedAt time.Time `db:"updated_at"`
+}
+
+type SpaceMember struct {
+	SpaceID  string    `db:"space_id"`
+	UserID   string    `db:"user_id"`
+	Role     Role      `db:"role"`
+	JoinedAt time.Time `db:"joined_at"`
+}