migrations: drop module_version_states.index_timestamp not null

When a module is requested for the first time through frontend fetch,
the index_timestamp should be null, since the module has never appeared
in the index before.

Drop the not null constraint on module_version_states.index_timestamp to
make this possible.

For golang/go#46985

Change-Id: I7f08c35307aec485fb212e490031e809971c9341
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/341891
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
2 files changed
tree: 90c64b76a0955fe437d778ed6d91a9562ff2c5b1
  1. cmd/
  2. devtools/
  3. doc/
  4. internal/
  5. migrations/
  6. static/
  7. tests/
  8. third_party/
  9. .dockerignore
  10. .eslintignore
  11. .eslintrc.yaml
  12. .gitignore
  13. .prettierignore
  14. .prettierrc.yaml
  15. .stylelintignore
  16. .stylelintrc.yaml
  17. all.bash
  18. cloudbuild.yaml
  19. CONTRIBUTING.md
  20. go.mod
  21. go.sum
  22. jest.config.js
  23. LICENSE
  24. package-lock.json
  25. package.json
  26. PATENTS
  27. README.md
  28. tsconfig.json
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