Document create_table_with_schema_locked setting

Fixes DOC-11544

Summary of changes:

- XXX

Author: rmloveland

src/current/_includes/v25.3/misc/session-vars.md

@@ -9,6 +9,7 @@
 | <a id="copy-transaction-quality-of-service"></a> `copy_transaction_quality_of_service` | The default quality of service for [`COPY`]({% link {{ page.version.version }}/copy.md %}) statements in the current session. The supported options are `regular`, `critical`, and `background`. See [Set quality of service level]({% link {{ page.version.version }}/admission-control.md %}#copy-qos). | `background` | Yes | Yes |
 | <a id="cost-scans-with-default-col-size"></a> `cost_scans_with_default_col_size` | Whether to prevent the optimizer from considering column size when costing plans. | `false` | Yes | Yes |
 | <a id="crdb-version"></a> `crdb_version` | The version of CockroachDB. | <code>CockroachDB OSS <i>version</i></code> | No | Yes |
+| `create_table_with_schema_locked` | [XXX]() | [XXX]() | Yes? | Yes? |
 | <a id="database"></a> `database` | The [current database]({% link {{ page.version.version }}/sql-name-resolution.md %}#current-database). | Database in connection string, or empty if not specified. | Yes | Yes |
 | <a id="datestyle"></a> `datestyle` | The input string format for [`DATE`]({% link {{ page.version.version }}/date.md %}) and [`TIMESTAMP`]({% link {{ page.version.version }}/timestamp.md %}) values. Accepted values include `ISO,MDY`, `ISO,DMY`, and `ISO,YMD`. | The value set by the `sql.defaults.datestyle` [cluster setting]({% link {{ page.version.version }}/cluster-settings.md %}) (`ISO,MDY`, by default). | Yes | Yes |
 | <a id="default-int-size"></a> `default_int_size` | The size, in bytes, of an [`INT`]({% link {{ page.version.version }}/int.md %}) type. | `8` | Yes | Yes |

src/current/_includes/v25.3/misc/table-storage-parameters.md

@@ -12,4 +12,12 @@ The following parameters are included for PostgreSQL compatibility and do not af
 - `autovacuum_enabled`
 - `fillfactor`
 
-For the list of storage parameters that affect how [Row-Level TTL]({% link {{ page.version.version }}/row-level-ttl.md %}) works, see the list of [TTL storage parameters]({% link {{ page.version.version }}/row-level-ttl.md %}#ttl-storage-parameters).
+For the list of storage parameters that affect how [Row-Level TTL]({% link {{ page.version.version }}/row-level-ttl.md %}) works, see the list of [TTL storage parameters]({% link {{ page.version.version }}/row-level-ttl.md %}#ttl-storage-parameters).
+
+{% include_cached new-in.html version="v25.3" %}
+
+All new tables are created with `schema_locked` set to `true`. This setting must be explicitly unset for explicit transactions, or for schema changes that do not support automatically disabling `schema_locked` (e.g., [`ALTER TABLE ... SET LOCALITY`](XXX)).
+
+To improve changefeed performance, the session variable create_table_with_schema_locked is now enabled by default. This means all new tables are created with schema_locked. 
+
+[XXX](XXX): YOU ARE HERE

src/current/v25.3/create-table.md

@@ -113,6 +113,10 @@ Parameter | Description
 `opt_with_storage_parameter_list` |  A comma-separated list of [spatial index tuning parameters]({% link {{ page.version.version }}/spatial-indexes.md %}#index-tuning-parameters). Supported parameters include `fillfactor`, `s2_max_level`, `s2_level_mod`, `s2_max_cells`, `geometry_min_x`, `geometry_max_x`, `geometry_min_y`, and `geometry_max_y`. The `fillfactor` parameter is a no-op, allowed for PostgreSQL-compatibility.<br><br>For details, see [Spatial index tuning parameters]({% link {{ page.version.version }}/spatial-indexes.md %}#index-tuning-parameters). For an example, see [Create a spatial index that uses all of the tuning parameters]({% link {{ page.version.version }}/spatial-indexes.md %}#create-a-spatial-index-that-uses-all-of-the-tuning-parameters).
 `ON COMMIT PRESERVE ROWS` | This clause is a no-op, allowed by the parser for PostgreSQL compatibility. CockroachDB only supports session-scoped [temporary tables]({% link {{ page.version.version }}/temporary-tables.md %}), and does not support the clauses `ON COMMIT DELETE ROWS` and `ON COMMIT DROP`, which are used to define transaction-scoped temporary tables in PostgreSQL.
 
+## Table storage parameters
+
+{% include {{ page.version.version }}/misc/table-storage-parameters.md %}
+
 ## Column qualifications
 
 CockroachDB supports the following column qualifications: