feat: move db gen out, emit json field

internal/db/models.go

@@ -0,0 +1,11 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.29.0
+
+package db
+
+type Author struct {
+	ID   int64   `json:"id"`
+	Name string  `json:"name"`
+	Bio  *string `json:"bio"`
+}