Store event payloads in separate key

[cschleiden]

Contributes to: #39

[cschleiden]

!bench !large !verylarge

[cschleiden]

!bench !large

[github-actions]

Default run

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mysql-main	397.1 ± 61.6	338.7	531.3	1.02 ± 0.22
mysql-pr	388.9 ± 56.4	288.9	484.0	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
sqlite-main	613.0 ± 137.5	413.6	848.5	1.08 ± 0.34
sqlite-pr	565.8 ± 125.1	419.0	817.1	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
redis-main	144.1 ± 20.3	120.7	184.2	1.00
redis-pr	151.6 ± 17.9	130.3	178.5	1.05 ± 0.19

Large payload run (1MB)

Command	Mean [s]	Min [s]	Max [s]	Relative
mysql-main	25.225 ± 1.022	23.990	26.976	1.00
mysql-pr	28.509 ± 9.878	24.180	56.520	1.13 ± 0.39

Command	Mean [s]	Min [s]	Max [s]	Relative
sqlite-main	21.766 ± 0.608	20.362	22.421	1.03 ± 0.05
sqlite-pr	21.230 ± 0.811	20.184	22.520	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
redis-main	22.134 ± 0.505	21.359	22.794	1.06 ± 0.05
redis-pr	20.977 ± 0.764	19.916	21.812	1.00