Prepared queries for chatmarkers and smart_markers

[leszke]

No description provided.

[codecov]

Codecov Report

Merging #3066 (8564402) into master (8a4e707) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3066      +/-   ##
==========================================
- Coverage   78.76%   78.75%   -0.02%     
==========================================
  Files         378      378              
  Lines       31102    31086      -16     
==========================================
- Hits        24499    24481      -18     
- Misses       6603     6605       +2     

Impacted Files	Coverage Δ
src/mod_smart_markers_rdbms.erl	92.30% <100.00%> (-1.03%)	⬇️
src/offline/mod_offline_chatmarkers_rdbms.erl	100.00% <100.00%> (+2.94%)	⬆️
src/ejabberd.erl	45.00% <0.00%> (-10.00%)	⬇️
src/pubsub/node_hometree.erl	77.77% <0.00%> (-5.56%)	⬇️
src/cassandra/mongoose_cassandra_worker.erl	70.75% <0.00%> (-2.36%)	⬇️
src/global_distrib/mod_global_distrib_utils.erl	65.09% <0.00%> (-0.95%)	⬇️
src/ejabberd_sm.erl	75.91% <0.00%> (-0.61%)	⬇️
src/mod_bosh_socket.erl	78.88% <0.00%> (-0.32%)	⬇️
src/ejabberd_c2s.erl	89.33% <0.00%> (-0.08%)	⬇️
src/mod_muc_room.erl	77.50% <0.00%> (-0.06%)	⬇️
... and 4 more

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[chrzaszcz]

Good work! I only have a few minor comments.

[chrzaszcz]

Great!