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diff --git a/lib/qualified_name.mli b/lib/qualified_name.mli
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+++ b/lib/qualified_name.mli
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+(** Fully qualified relation name: [multigroup:schema:relation].
+
+    Unqualified names fill in defaults: empty multigroup, ["public"] schema. *)
+
+type t = {
+  multigroup : string;
+  schema : string;
+  relation : string;
+}
+
+val default_schema : string
+
+(** Split on [:] with default filling.
+    - ["rel"]           -> multigroup="", schema="public", relation="rel"
+    - ["s:rel"]         -> multigroup="", schema="s",      relation="rel"
+    - ["mg:s:rel"]      -> multigroup="mg", schema="s",    relation="rel" *)
+val parse : string -> t
+
+val make : ?multigroup:string -> ?schema:string -> string -> t
+val to_string : t -> string
+
+(** Composite key for [RelationMap] lookup within a single database:
+    ["schema:relation"]. *)
+val to_key : t -> string