Change default value of metadata cache expiration time

[brfrn169]

Description

This PR changes the default value of the metadata cache expiration time (scalar.db.metadata.cache_expiration_time_secs) to 60 seconds. Strictly speaking, this may be an incompatible change, but I don't expect it to cause any problems. If there are any objections, please let me know.

Related issues and/or PRs

N/A

Changes made

• Changed the default value of the metadata cache expiration time (scalar.db.metadata.cache_expiration_time_secs) to 60 seconds.

Checklist

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

N/A

Release notes

Changed the default value of the metadata cache expiration time (scalar.db.metadata.cache_expiration_time_secs) to 60 seconds.

[kota2and3kan]

LGTM! Thank you!

[jnmt]

LGTM! Thank you! I think this could reduce a chance that developer's face troubles when they change the schema in short term.

[komamitsu]

LGTM! 💯 💯 💯

[feeblefakie]

LGTM! Thank you!

[brfrn169]

@Torch3333 I'll merge this. Please take a look when you are back.