add db models, refactor json models, add references in migrations

internal/foundry/models/json/release.go

@@ -0,0 +1,11 @@
+package json
+
+type Release struct {
+	Generation   int      `json:"generation"`
+	Channel      string   `json:"channel"`
+	Suffix       string   `json:"suffix"`
+	Build        int      `json:"build"`
+	Node_version int      `json:"node_version"`
+	Time         int64    `json:"time"`
+	flags        struct{} `json:"-"`
+}