Speed up retrieval of lemma suggestions

[codecov[bot]]

Codecov Report

Merging #98 into master will not change coverage. The diff coverage is 0%.

@@            Coverage Diff            @@
##             master      #98   +/-   ##
=========================================
  Coverage     29.97%   29.97%           
  Complexity     1333     1333           
=========================================
  Files            63       63           
  Lines          7405     7405           
=========================================
  Hits           2220     2220           
  Misses         5185     5185

Flag	Coverage Δ	Complexity Δ
#backend	52.37% <0%> (ø)	1333 <0> (ø)	:arrow_down:
#frontend	0.53% <ø> (ø)	0 <ø> (ø)	:arrow_down:

Impacted Files	Coverage Δ	Complexity Δ
src/lib/connect.php	50.43% <0%> (ø)	245 <0> (ø)	:arrow_down:

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[mbollmann]

Re #72