refactor: unify tags and edges into single rels table

service/node_service.go

@@ -31,44 +31,40 @@ type NodeService interface {
 }
 
 // AddInput describes a new node to create.
-// Tags may include special property tags (_type::, _status::, _prio::); the
-// service applies defaults (type=issue, status=open for issues) and validates.
-// Rels may include assignee, in_namespace, blocks, subtask, related, etc.;
-// user and namespace targets are auto-created as needed.
+// Rels may contain tag rels (Target == ""), property rels (Target == "",
+// Type is "prefix::value"), and edge rels (Target is a node name or ID).
+// The service applies defaults (type=issue, status=open for issues) and validates.
 type AddInput struct {
 	Title   string
 	Content string
 	DueDate string
-	Tags    []string
 	Rels    []RelInput
 }
 
 // UpdateInput describes changes to apply to an existing node.
-// Nil pointer fields mean "no change".
-// Setting _status::done in AddTags is rejected when the node has open blockers.
+// AddRels and RemoveRels accept both tag rels (Target == "") and edge rels.
+// Setting _status::done in AddRels is rejected when the node has open blockers.
 // Adding assignee or in_namespace rels replaces the previous single target.
 type UpdateInput struct {
 	Title      *string
 	Content    *string
 	DueDate    *string // nil = no change; pointer to "" = clear due date
-	AddTags    []string
-	RemoveTags []string
 	AddRels    []RelInput
 	RemoveRels []RelInput
 }
 
 // ListFilter specifies which nodes to return. Empty slices are ignored.
-// Tags are matched as exact tag values or prefixes (e.g. "_status::open").
-// Rels are resolved to node IDs; a missing target returns no results.
+// Tag filters (Target == "") match by rel_name prefix.
+// Edge filters (Target != "") are resolved to node IDs.
 type ListFilter struct {
-	Tags []string
 	Rels []RelInput
 }
 
-// RelInput is a typed, directed edge with a target that may be a name or node ID.
+// RelInput is a typed, directed rel with a target that may be a name or node ID.
+// Target == "" means this is a tag or property rel (no target node).
 type RelInput struct {
 	Type   models.RelType
-	Target string // name or node ID; the service resolves names
+	Target string // name or node ID; the service resolves names. Empty = tag rel.
 }
 
 func InitNodeService(path string) error {