Feat: add storage interface; add sqlite impl

models/db.go

@@ -0,0 +1,11 @@
+package models
+
+import "time"
+
+type Chat struct {
+	ID        uint32    `db:"id" json:"id"`
+	Name      string    `db:"name" json:"name"`
+	Msgs      string    `db:"msgs" json:"msgs"` // []MessagesStory to string json
+	CreatedAt time.Time `db:"created_at" json:"created_at"`
+	UpdatedAt time.Time `db:"updated_at" json:"updated_at"`
+}