title Create query

actor User as U
participant Frontend as F
participant Backend as B
participant Database as D

U->F: enter context
F->U: OK
U->F: enter query
F->U: OK
U->F: save / run query
F->B: save / run query
B->D: fetch from context
D->B: OK
B->B: evaluate / plan query
B->D: save / run query
D->B: result
B->F: result
F->U: result