feat(core/database): add Reference struct

crates/core/database/Cargo.toml

@@ -14,6 +14,7 @@ mongodb = [ "dep:mongodb" ]
 
 # ... Other
 async-std-runtime = [ "async-std" ]
+rocket-impl = [ "rocket", "schemars" ]
 
 # Default Features
 default = [ "mongodb", "async-std-runtime" ]
@@ -42,5 +43,9 @@ async-recursion = "1.0.4"
 # Async
 async-std = { version = "1.8.0", features = ["attributes"], optional = true }
 
+# Rocket Impl
+schemars = { version = "0.8.8", optional = true }
+rocket = { version = "0.5.0-rc.2", default-features = false, features = ["json"], optional = true }
+
 # Authifier
 authifier = { version = "1.0" }