Improve compatibility

docs/sql_cheatsheet.md

@@ -65,7 +65,7 @@ SET is_open=0,
   close_rate=<close_rate>,
   close_profit = close_rate / open_rate - 1,
   close_profit_abs = (amount * <close_rate> * (1 - fee_close) - (amount * (open_rate * (1 - fee_open)))),
-  sell_reason=<sell_reason>
+  exit_reason=<exit_reason>
 WHERE id=<trade_ID_to_update>;
 ```
 
@@ -78,7 +78,7 @@ SET is_open=0,
   close_rate=0.19638016,
   close_profit=0.0496,
   close_profit_abs = (amount * 0.19638016 * (1 - fee_close) - (amount * (open_rate * (1 - fee_open)))),
-  sell_reason='force_sell'  
+  exit_reason='force_sell'  
 WHERE id=31;
 ```
 

docs/strategy_migration.md

@@ -24,8 +24,12 @@ You can use the quick summary as checklist. Please refer to the detailed section
   * [`sell` -> `exit_long`](#populate_sell_trend)
   * [`buy_tag` -> `enter_tag` (used for both long and short trades)](#populate_buy_trend)
   * [New column `enter_short` and corresponding new column `exit_short`](#populate_sell_trend)
-* trade-object now has the following new properties: `is_short`, `enter_side`, `exit_side` and `trade_direction`.
-  * `sell_reason` -> `exit_reason`
+* trade-object now has the following new properties:
+  * `is_short`
+  * `enter_side`
+  * `exit_side`
+  * `trade_direction`
+  * renamed: `sell_reason` -> `exit_reason`
 * [Renamed `trade.nr_of_successful_buys` to `trade.nr_of_successful_entries` (mostly relevant for `adjust_trade_position()`)](#adjust-trade-position-changes)
 * Introduced new [`leverage` callback](strategy-callbacks.md#leverage-callback).
 * Informative pairs can now pass a 3rd element in the Tuple, defining the candle type.