docgen: add as_of_clause diagram (clean 4 Bazel file demo)

[ebembi-crdb]

Summary

Clean demo showing the full process for adding a new SQL diagram.

1 commit, 6 files:

• diagrams.go - spec entry
• 4 Bazel files - BUILD.bazel, bnf.bzl, diagrams.bzl, docs.bzl
• Workflow file (for CI to run)

No manual BNF file - CI generates it automatically from sql.y.

Grammar

as_of_clause ::=
    'AS' 'OF' 'SYSTEM' 'TIME' a_expr

Used in time travel queries: SELECT * FROM t AS OF SYSTEM TIME '-1m'

[github-actions]

SQL Diagram Generation Report

✅ Validation Passed

🔄 Diagram changes detected
A PR has been opened to sync these changes: ebembi-crdb/generated-diagrams#19

Changed Diagram Previews

as_of_clause

Showing 1 changed diagram(s). Only diagrams that differ from master are shown.

SKIP DOC Warnings (click to expand)

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