Werk #11630: mk_oracle: Show cached information in column 'checked' in case of async custom SQLs

In general cached sections are marked with two timestamps:

• the timestamp of the data collection (resp. execution)
• the timestamp until when the section is treated as valid

On the Checkmk server the service columns "checked" or "age" display the evaluated timestamps.

Custom SQLs of the "mk_oracle" can be declared as asynchrounous sections and are executed in different intervals. In order to see the cached information for "Oracle Custom SQLs" you have to re-install the mk_oracle plugin.

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