Add slashing protection repair cli (#295)

docs/HowTo/Troubleshoot/Troubleshooting.md

@@ -105,7 +105,8 @@ If all recent attestations are marked as missed, check the following:
 * **Is the beacon node still syncing?**
 
     Validators can only attest when the beacon node is in sync. If you see lines similar to,
-    `teku-event-log | Syncing  *** Target slot: 2017218, Head slot: 123456, Remaining slots: 2015500, Connecting peers: 12`, then the node is
+
+    `teku-event-log | Syncing     *** Target slot: 2017218, Head slot: 123456, Remaining slots: 2015500, Connecting peers: 12`, then the node is
     still syncing.
 
     Syncing is complete when the head slot reaches the current slot. If the node is synced, the

docs/Reference/CLI/Subcommands/Slashing-Protection.md

@@ -146,7 +146,151 @@ The file to export the slashing protection database to.
 
 Exports the database in the [validator client interchange format] format.
 
+## `repair`
+
+Repairs corrupted slashing-protection data files used by Teku.
+
+### check-only-enabled
+
+=== "Syntax"
+
+    ```bash
+    teku slashing-protection repair --checking-only-enabled[=<BOOLEAN>]
+    ```
+
+=== "Command Line"
+
+    ```bash
+    teku slashing-protection repair --checking-only-enabled=false
+    ```
+
+Reads and reports potential slashing-protection file problems, but doesn't update any files.
+You can specify which files are checked using [`--config-file`](#config-file_2), [`--data-base-path`](#data-base-path-data-path).
+
+### config-file
+
+=== "Syntax"
+
+    ```bash
+    teku slashing-protection repair --config-file=<FILE>
+    ```
+
+=== "Command Line"
+
+    ```bash
+    teku slashing-protection repair --config-file=/home/me/me_node/config.yaml
+    ```
+
+The path to the YAML configuration file.
+The default is `none`.
+
+### data-base-path, data-path
+
+=== "Syntax"
+
+    ```bash
+    teku slashing-protection repair --data-base-path=<PATH>
+    ```
+
+=== "Command Line"
+
+    ```bash
+    teku slashing-protection repair --data-base-path=/home/me/me_node
+    ```
+
+The path to the Teku data directory. The default directory is OS dependent:
+
+* macOS: `~/Library/teku`
+* Unix/Linux: `$XDG_DATA_HOME/teku` if `$XDG_DATA_HOME` is set; otherwise `~/.local/share/teku`
+* Windows: `%localappdata%\teku`.
+
+The default Docker image location is `/root/.local/share/teku`.
+
+### data-validator-path
+
+=== "Syntax"
+
+    ```bash
+    teku slashing-protection repair --data-validator-path=<PATH>
+    ```
+
+=== "Command Line"
+
+    ```bash
+    teku slashing-protection repair --data-validator-path=/home/me/me_validator
+    ```
+
+Path to validator client data. Defaults to `<data-base-path>/validator` where `<data-base-path>`
+is specified using [`--data-base-path`](#data-base-path-data-path).
+
+### network
+
+=== "Syntax"
+
+    ```bash
+    teku slashing-protection repair --network=<NETWORK>
+    ```
+
+=== "Command Line"
+
+    ```bash
+    teku slashing-protection repair --network=mainnet
+    ```
+
+Predefined network configuration. Accepts a predefined network name, or file path or URL
+to a YAML configuration file. The default is `mainnet`.
+
+Possible values are:
+
+| Network   | Chain   | Type        | Description                                      |
+|-----------|---------|-------------|--------------------------------------------------|
+| `mainnet` | Eth 2.0 | Production  | Main network.                                    |
+| `minimal` | Eth 2.0 | Test        | Used for local testing and development networks. |
+| `pyrmont` | Eth 2.0 | Test        | Multi-client testnet.                            |
+| `prater`  | Eth 2.0 | Test        | Multi-client testnet.                            |
+
+Predefined networks can provide defaults such the initial state of the network,
+bootnodes, and the address of the Ethereum 1.0 deposit contract.
+
+### slot
+
+=== "Syntax"
+
+    ```bash
+    teku slashing-protection repair --slot=<INTEGER>
+    ```
+
+=== "Command Line"
+
+    ```bash
+    teku slashing-protection repair --slot=1028
+    ```
+
+Updates slashing protection files to contain the specified slot as a minimum. The value should be a future
+slot, or after when the validators stopped performing duties.
+
+!!! note
+
+    This can be automatically calculated for most networks, and is generally not required.
+
+### update-all-enabled
+
+=== "Syntax"
+
+    ```bash
+    teku slashing-protection repair --update-all-enabled[=<BOOLEAN>]
+    ```
+
+=== "Command Line"
+
+    ```bash
+    teku slashing-protection repair --update-all-enabled=false
+    ```
+
+Enables all slashing-protection records to be updated. Defaults to `false`.
+
 <!-- links -->
 [slashing protection data]: ../../../Concepts/Slashing-Protection.md
 [validator client interchange format]: https://eips.ethereum.org/EIPS/eip-3076
 [environment variables or a configuration file]: ../CLI-Syntax.md#specifying-options
+[recent finalized checkpoint state from which to sync]: ../../../HowTo/Get-Started/Checkpoint-Start.md