docs(features): say what clearing a typed cell writes

databases/redis.mdx

@@ -110,7 +110,7 @@ A **Type**, **TTL**, **Length** or **Value** cell is NULL when the server will n
 
 ### Editing
 
-Editing a **Key** cell runs `RENAME`. Editing a **TTL** cell runs `EXPIRE`, or `PERSIST` when you set it to `-1` or NULL; in that column `-1` means no expiry and `-2` means the key is gone. Editing a **Value** cell runs `SET`, and only on a string, since a preview of a hash or list is not the whole structure.
+Editing a **Key** cell runs `RENAME`. Editing a **TTL** cell runs `EXPIRE`, or `PERSIST` when you clear it or set it to `-1` or NULL; in that column `-1` means no expiry and `-2` means the key is gone. Editing a **Value** cell runs `SET`, and only on a string, since a preview of a hash or list is not the whole structure.
 
 Save sends nothing, names the reason and keeps your edits when a row holds an edit these commands cannot make: a **Value** edit on any type but a string, a NULL **Value**, a **Type** edit, or a **TTL** that is not a whole number of seconds above 0.
 

features/change-tracking.mdx

@@ -18,7 +18,7 @@ A queued change also marks the value itself, so it stays legible once the row is
 
 ## Editing a cell
 
-Double-click a cell, or press `Enter` on it. `Enter` commits the edit to the queue, `Escape` cancels. Setting a value back to what it was drops it from the queue again. Some types open an editor of their own:
+Double-click a cell, or press `Enter` on it. `Enter` commits the edit to the queue, `Escape` cancels. Setting a value back to what it was drops it from the queue again. Delete the text of a date, number, boolean, JSON or array cell to store NULL. In a NOT NULL column of those types the cell keeps its value, and an emptied text cell stores an empty string. Some types open an editor of their own:
 
 | Column type | Editor |
 |---|---|
@@ -36,7 +36,7 @@ Double-click a cell, or press `Enter` on it. `Enter` commits the edit to the que
   <img className="hidden dark:block" src="/images/date-picker-editor-dark.png" alt="Cell editor" />
 </Frame>
 
-Right-click an editable cell and open **Set Value** for the common ones without typing: **Empty**, **NULL** on a nullable column, **Default** on a column the server fills in, and date functions such as `NOW()` or `CURRENT_DATE` on date columns.
+Right-click an editable cell and open **Set Value** for the common ones without typing: **Empty** on text, `SET` and binary columns, **NULL** on a nullable column, **Default** on a column the server fills in, and date functions such as `NOW()` or `CURRENT_DATE` on date columns.
 
 On MongoDB, Firestore and the Firebase Realtime Database a document can lack a field altogether, and on Bigtable a row can lack a cell; the grid shows either as **No Field**. **Remove Field** on the same right-click menu deletes the field rather than storing NULL. Bigtable stores no NULL, so **NULL** and **Remove Field** both delete the cell. See [missing fields and null](/databases/mongodb#missing-fields-and-null).
 

features/data-grid.mdx

@@ -110,7 +110,7 @@ Step back with **View > Back** (`Ctrl+Cmd+[`) and **View > Forward** (`Ctrl+Cmd+
 
 Press `Cmd+Option+I`, or click the button at the trailing end of the toolbar, to open the inspector beside the grid. The table and which row of how many is selected sit under the [pane's header](/features/connection-window#the-trailing-pane), and **Fields** and **JSON** are the two renderings of that row, picked from the header's ellipsis menu. [Cell and Row Viewers](/features/json-viewer) covers both. Turn on **Auto-show inspector on row select** in [Settings > Data](/customization/data-settings) to open it whenever a row is picked, in a query result as well as a table.
 
-Short values sit on one line, label leading and value trailing. Long text, JSON, PHP, binary and images take the full width. Long text and JSON carry a resize handle; PHP, binary and images draw at a fixed height. `Tab` and `Shift+Tab` move between fields; the menu at the trailing edge of each field carries **Set NULL**, **Set DEFAULT**, **Set EMPTY** and **SQL Functions**, with `Ctrl+Option+N` and `Ctrl+Option+D` as shortcuts for the first two. Search filters the list by column name or stored value, and the pencil button narrows it to fields already edited.
+Short values sit on one line, label leading and value trailing. Long text, JSON, PHP, binary and images take the full width. Long text and JSON carry a resize handle; PHP, binary and images draw at a fixed height. `Tab` and `Shift+Tab` move between fields; the menu at the trailing edge of each field carries **Set NULL**, **Set DEFAULT**, **SQL Functions**, and **Set EMPTY** on a text, `SET` or binary field, with `Ctrl+Option+N` and `Ctrl+Option+D` as shortcuts for the first two. Search filters the list by column name or stored value, and the pencil button narrows it to fields already edited.
 
 With no row selected and a table open, the inspector shows that table's size, row count, engine, collation and timestamps, as far as the database reports them. They are read only while the inspector is open.
 

features/json-viewer.mdx

@@ -160,7 +160,7 @@ The text box, the JSON editor and the map each carry a drag handle under them, w
 
 **Open in Window** detaches a JSON, PHP or text value into its own resizable window; on an editable row, edits there join the same pending changes as the field. An image and a map detach read-only. The expand button on a JSON, PHP, long text or geometry field grows it to fill the inspector's height with the other fields still listed around it; click it again to shrink it back. Binary and image fields draw at a fixed height and carry no expand button, and neither does a geometry field stored as bytes, whose map still takes the drag handle.
 
-Every field carries a menu at its trailing edge, and right-clicking the field opens the same one. **Set NULL**, **Set DEFAULT**, **Set EMPTY** and **SQL Functions** need an editable field; `Ctrl+Option+N` and `Ctrl+Option+D` reach the first two from the keyboard. **Copy Value** is always there, and a read-only field keeps its text selectable.
+Every field carries a menu at its trailing edge, and right-clicking the field opens the same one. **Set NULL**, **Set DEFAULT**, **Set EMPTY** and **SQL Functions** need an editable field, and **Set EMPTY** a text, `SET` or binary one; `Ctrl+Option+N` and `Ctrl+Option+D` reach the first two from the keyboard. **Copy Value** is always there, and a read-only field keeps its text selectable.
 
 With no row selected, the inspector describes the table the tab is bound to: data, index and total size, row count, average row size, engine, collation, and creation and update dates, as far as the database reports them. A tab with no table of its own, such as a query, leaves it empty. On a Structure tab it follows the structure grid and names the selected column.