refactor: remove empty services (#116)

* remove empty services

* remove old factory

* remove old static files

* cleanup more duplicate service code

* file/folder reorg

backend/internal/data/ent/external.go

@@ -0,0 +1,13 @@
+package ent
+
+import (
+	"database/sql"
+
+	entsql "entgo.io/ent/dialect/sql"
+)
+
+// Sql exposes the underlying database connection in the ent client
+// so that we can use it to perform custom queries.
+func (c *Client) Sql() *sql.DB {
+	return c.driver.(*entsql.Driver).DB()
+}