Start work on hooks and subscriptions

database/iterator/iterator.go

@@ -7,6 +7,7 @@ import (
 // Iterator defines the iterator structure.
 type Iterator struct {
 	Next  chan record.Record
+	Done  chan struct{}
 	Error error
 }
 
@@ -14,5 +15,6 @@ type Iterator struct {
 func New() *Iterator {
 	return &Iterator{
 		Next: make(chan record.Record, 10),
+		Done: make(chan struct{}),
 	}
 }