-`"key"`– Identifier for the memory entry to store.
-`"value"`– The string value to associate with the key.
**Description**
`SET_BOT_MEMORY` stores a key‑value pair in the persistent bot memory table (`bot_memories`). The entry is scoped to the bot instance, not to a specific user. If the key already exists, its value is updated; otherwise a new row is inserted. The operation is performed asynchronously in a background task, so the keyword returns immediately.
**Example**
```basic
SET_BOT_MEMORY "last_greeting", "Hello, world!"
TALK "Bot memory updated."
```
After execution, the key `last_greeting` will contain the value `"Hello, world!"` and can be retrieved later with `GET_BOT_MEMORY`.
**Implementation Notes**
- The keyword spawns a Tokio task that acquires a database connection, checks for an existing entry, and either updates or inserts the record.
- Errors are logged but do not interrupt script execution; the keyword always returns `UNIT`.
- Values are stored as plain strings; binary data should be encoded (e.g., Base64) before storage.
