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# Epoch and slot column names

> EPOCH_NUMBER and SLOT_NUMBER on beacon.raw tables; legacy EPOCH and SLOT columns dropped May 23, 2026

[← Back to schema changes overview](/historical-data/supported-blockchains/evm/beacon-chain/schema-changes)

We are standardizing how Beacon Chain tables expose epoch and slot identifiers so they match our naming on newer networks (for example Hoodi) and are easier to use in joins and analytics.

**Last published:** April 20, 2026

## What’s changing

New columns **`EPOCH_NUMBER`** and **`SLOT_NUMBER`** are available **alongside** the legacy **`EPOCH`** and **`SLOT`** columns on April 9, 2026.

| Table (fully qualified)           | Legacy columns (dropped May 23, 2026) | New columns                   |
| --------------------------------- | ------------------------------------- | ----------------------------- |
| **`beacon.raw.validator_duties`** | `EPOCH`, `SLOT`                       | `EPOCH_NUMBER`, `SLOT_NUMBER` |
| **`beacon.raw.ideal_rewards`**    | `EPOCH`                               | `EPOCH_NUMBER`                |
| **`beacon.raw.total_rewards`**    | `EPOCH`                               | `EPOCH_NUMBER`                |

Values in **`EPOCH_NUMBER`** and **`SLOT_NUMBER`** match the same underlying data as **`EPOCH`** and **`SLOT`** before the drop.

<Warning>
  **May 23, 2026 — legacy columns removed**

  On **May 23, 2026**, we will **drop** the legacy identifiers:

  * **`EPOCH`** — removed from **`beacon.raw.validator_duties`**, **`beacon.raw.ideal_rewards`**, and **`beacon.raw.total_rewards`**
  * **`SLOT`** — removed from **`beacon.raw.validator_duties`** only

  After that date, use **`EPOCH_NUMBER`** and **`SLOT_NUMBER`** only.
</Warning>

## Timeline

| Date                           | Milestone                                                                                                                                                                                                                                        |
| ------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Effective by April 9, 2026** | New columns **`EPOCH_NUMBER`** and **`SLOT_NUMBER`** are available alongside **`EPOCH`** and **`SLOT`** (rollout may be staged by environment).                                                                                                  |
| **May 21, 2026**               | **Please complete migration** — Move queries, saved reports, models, and dashboards to **`EPOCH_NUMBER`** and **`SLOT_NUMBER`** (instead of **`EPOCH`** and **`SLOT`**) everywhere you control the logic, before the legacy columns are removed. |
| **May 23, 2026**               | **Breaking change:** Legacy columns **`EPOCH`** and **`SLOT`** are **dropped** (see [What’s changing](#whats-changing)). Queries that still reference them will fail until updated.                                                              |

## What this means for you

* **Until May 23, 2026:** Queries that use **`EPOCH`** or **`SLOT`** continue to work; migrate in parallel using **`EPOCH_NUMBER`** / **`SLOT_NUMBER`**.
* **From May 23, 2026:** **`EPOCH`** and **`SLOT`** will no longer exist on these tables — you must use **`EPOCH_NUMBER`** and **`SLOT_NUMBER`**.
* **Recommended path:** Prefer **`EPOCH_NUMBER`** and **`SLOT_NUMBER`** in all new or updated queries and dashboards, and complete rewrites of existing logic **by May 21, 2026** (see [Timeline](#timeline)).

## Suggested migration (at your pace)

| Horizon             | Action                                                                                                                        |
| ------------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| **Short term**      | Inventory uses of **`EPOCH`** and **`SLOT`**; test with **`EPOCH_NUMBER`** / **`SLOT_NUMBER`** in parallel.                   |
| **By May 21, 2026** | **Switch** references from **`EPOCH`** → **`EPOCH_NUMBER`** and **`SLOT`** → **`SLOT_NUMBER`**, validate results, and deploy. |
| **May 23, 2026**    | Legacy columns **`EPOCH`** and **`SLOT`** are **removed** — no further action possible except using the new column names.     |

## Questions or support

If you need help mapping queries or BI models to the new names, contact [Allium Support](mailto:support@allium.so) or your usual account channel.