docs(node-operators): state the october 5, 2026 v1 snapshot cutoff

[youssefea]

What changed? Why?

Updates the warning on Node Snapshots (docs/specifications/node-operators/snapshots.mdx). The old text said "by mid-August" and "over the next few weeks", which are now out of date. The new text gives the exact cutoff: Base stopped publishing V1 node database snapshots on October 5, 2026. It also links the status notice and the V2 snapshot source. Operators who still use V1 storage are told to upgrade to base-reth-node v1.2.0 or later. The two migration paths stay, including the warning that migrate-v2 is much slower and does not support non-archival nodes.

Closes knowledge gap gap-20260930-v1-node-snapshot-cutoff-date-exact: "Are Base V1 node snapshots still published, when is the exact cutoff/decommission date, and where do node operators find the V2 snapshot migration path?"

• Gaps log: https://bdocs.cbhq.net/d/base-knowledge-gaps-log
• Linear: DEVREL-859

Notes to reviewers

Primary sources:

• October 5, 2026 cutoff, applies to Mainnet and Testnet snapshots, V2 snapshots at chain.base.org/snapshots: Base status notice https://status.base.org/incidents/jx4p15jppftm
• v1.2.0 requirement, base-reth-node download (recommended) vs. base-reth-node db migrate-v2 (much slower, non-archival nodes not supported): https://github.com/base/base/releases/tag/v1.2.0

Owner confirmation (Node/base-reth-node team) before merge: please confirm that the operational wording is right. Specifically, confirm that V1 snapshots are no longer served on either network, and that "v1.2.0 or later" is the right minimum version for V2 storage.

This replaces the snapshots.mdx part of #2092, which bundled several unrelated changes. The cross-link #2092 added to docs/upgrades/beryl/reth-v2.mdx is not included here.

How has it been tested?

• node scripts/lint-mdx.js --files-from=<changed files>: 0 errors, 0 warnings.
• node scripts/validate-docs-structure.js: the only failures are the existing /upgrades/denim/eip-8130 redirect issues that are already on master. This PR does not touch them.
• The added external links (status.base.org notice, chain.base.org/snapshots, base/base v1.2.0 release) each returned HTTP 200.

Screenshots

N/A (text-only change)

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[linear]

DEVREL-859