feat(databases): add --expires-at option to databases create

[eddietejeda]

Summary

• Adds --expires-at flag to hotdata databases create
• Accepts a relative duration (e.g. 24h, 7d, 90m) or an RFC 3339 timestamp
• Omitting the flag lets the API default to 24h

Follows hotdata-dev/runtimedb#471 which added expires_at support to the API.

🤖 Generated with Claude Code

[claude]

Review

Blocking Issues

• src/databases.rs:129 — create_database_request gained a required 4th parameter expires_at: Option<&str>, but the six existing test callers in the same file (lines 655, 661, 668, 681, 863, 873) were not updated. cargo test / cargo check --tests will fail to compile.

Action Required

• Update all six test invocations of create_database_request to pass the new expires_at argument (likely None).
• Add test coverage for the new flag: at minimum, assert that Some("24h") is serialized into the request body as expires_at, and that the field is absent when None.

[sentry]

Codecov Report

❌ Patch coverage is 84.00000% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/databases.rs	91.30%	2 Missing ⚠️
src/main.rs	0.00%	2 Missing ⚠️

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