feat: add ordinal event dimension column

[abnegate]

Summary

• Add ordinal to EVENT_COLUMNS, the event schema, and event indexes so additive counters (dedicated-database inbound / outbound / compute) can split per member the way gauges already do.
• setup() ADD COLUMN IF NOT EXISTSs it onto existing event tables. The daily MV stays grouped on resource identity only, so a billing sum without an ordinal filter still totals every member.

Test plan

• tests/Usage/MetricTest.php and ClickHouseColumnTypeTest.php (56 tests)
• testEventOrdinalSeparatesReplicaSeries against ClickHouse (filter / groupBy / unsplit sum)

Made with Cursor

[greptile-apps]

Greptile Summary

This PR promotes replica ordinal from a gauge-only dimension to a shared event and gauge dimension.

• Adds ordinal to event validation, extraction, schema, and index definitions.
• Makes existing ClickHouse event tables acquire the column during setup while preserving ordinal-unsplit daily billing totals.
• Simplifies the Database adapter’s shared schema now that the event schema includes ordinal.
• Adds schema, extraction, column-type, filtering, grouping, and total-sum coverage.

Confidence Score: 5/5

The PR appears safe to merge; ordinal remains distinct in raw event series while unfiltered daily billing totals continue to include every member.

The dimension is aligned across validation, extraction, schemas, indexes, adapters, and tests. Existing Database collections already had ordinal through the former gauge-specific setup, and ClickHouse correctly routes ordinal-dependent queries away from the daily table that intentionally omits it.

Important Files Changed

Filename	Overview
src/Usage/Metric.php	Adds ordinal consistently across the event dimension contract, schema, extraction, accessor documentation, and indexes.
src/Usage/Adapter/Database.php	Removes the redundant gauge-only ordinal schema append now that the event schema supplies the shared field and index.
src/Usage/Adapter/ClickHouse.php	Updates ordinal classification for event and gauge schemas without changing daily-rollup grouping or routing behavior.
tests/Usage/Adapter/ClickHouseTest.php	Covers raw event filtering and grouping by ordinal while confirming an unsplit sum still totals all members.
tests/Usage/MetricTest.php	Updates the metric contract tests to verify ordinal as a shared event and gauge dimension.

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