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diff --git a/docs/query-execution-flow.puml b/docs/query-execution-flow.puml
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--- a/docs/query-execution-flow.puml
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-@startuml query-execution-flow
-!theme plain
-title Query Execution Flow
-
-actor Client
-participant "Query Planner" as Planner
-participant "Scan Iterator" as Scan
-participant "Select Iterator" as Select
-participant "Project Iterator" as Project
-participant "Operations API" as Ops
-database "Mnesia" as DB
-
-Client -> Planner: query({project,\n  {select, {scan, employee}, Pred},\n  [name, age]})
-activate Planner
-Planner -> Planner: parse & validate
-Planner -> Scan: spawn_iterator(employee)
-activate Scan
-Planner -> Select: spawn_iterator(Scan, Pred)
-activate Select
-Planner -> Project: spawn_iterator(Select, [name, age])
-activate Project
-Planner --> Client: {ok, Iterator}
-deactivate Planner
-
-Client -> Project: next_tuple()
-Project -> Select: next_tuple()
-Select -> Scan: next_tuple()
-Scan -> Ops: get_tuples_iterator(employee)
-Ops -> DB: transaction(read tuple)
-DB --> Ops: {ok, Tuple}
-Ops --> Scan: {ok, Tuple}
-Scan --> Select: {ok, Tuple}
-Select -> Select: apply Predicate
-Select --> Project: {ok, Tuple}
-Project -> Project: filter attributes
-Project --> Client: {ok, #{name => "Alice", age => 30}}
-
-Client -> Project: next_tuple()
-Project -> Select: next_tuple()
-Select -> Scan: next_tuple()
-Scan -> Ops: get_tuples_iterator(employee)
-Ops -> DB: transaction(read tuple)
-DB --> Ops: done
-Ops --> Scan: done
-Scan --> Select: done
-Select --> Project: done
-Project --> Client: done
-
-Client -> Project: close_iterator()
-deactivate Project
-deactivate Select
-deactivate Scan
-
-@enduml