Add clear function for the accounts table.

zcash_client_sqlite/src/wallet/init.rs

@@ -209,6 +209,17 @@ pub fn init_accounts_table<P: consensus::Parameters>(
     Ok(())
 }
 
+pub fn clear_accounts_table<P: consensus::Parameters>(
+    wdb: &WalletDb<P>,
+) -> Result<(), SqliteClientError> {
+    wdb.conn.execute("PRAGMA foreign_keys = OFF;", NO_PARAMS)?;
+    wdb.conn.execute( "DELETE FROM accounts;", NO_PARAMS, )?;
+    wdb.conn.execute("PRAGMA foreign_keys = ON;", NO_PARAMS)?;
+
+    Ok(())
+}
+
+
 /// Initialises the data database with the given block.
 ///
 /// This enables a newly-created database to be immediately-usable, without needing to