The strategy below is simply to understand the signal implementation, and not to trade live...

```python
from pandas import DataFrame
from freqtrade.strategy.interface import IStrategy

class ToggleHourlyDate(IStrategy):
    """
        Enter and exit every hour on the 1 minute timeframe using the 'date' column.
    """
    INTERFACE_VERSION: int = 3
    minimal_roi = {"0": 10}   # Close immediately at 1000% ROI.
    stoploss = -1             # SL at -100%.
    timeframe = '1m'

    def populate_indicators(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
        return dataframe

    def populate_entry_trend(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
        dataframe.loc[(dataframe['date'].dt.hour % 2 == 0) &
                      (dataframe['date'].dt.minute == 0), 'enter_long'] = 1
        return dataframe

    def populate_exit_trend(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
        dataframe.loc[(dataframe['date'].dt.hour % 2 != 0) &
                      (dataframe['date'].dt.minute == 0), 'exit_long'] = 1
        return dataframe
```

Explanation of the code:

```python
dataframe.loc[(dataframe['date'].dt.hour % 2 == 0) & (dataframe['date'].dt.minute == 0), 'enter_long'] = 1
```

This line uses the `.loc` method of the dataframe to select only the rows where the hour of the date column is even (`dataframe['date'].dt.hour % 2 == 0`) and the minute of the date column is zero (`dataframe['date'].dt.minute == 0`). Then it sets the value of the `enter_long` column in these selected rows to `1`.

```python
`dataframe.loc[(dataframe['date'].dt.hour % 2 != 0) & (dataframe['date'].dt.minute == 0), 'exit_long'] = 1
```

This line is similar to the previous one, but it selects the rows where the hour of the date column is odd (`dataframe['date'].dt.hour % 2 != 0`) and the minute of the date column is zero (`dataframe['date'].dt.minute == 0`), and sets the value of the `exit_long` column in these selected rows to `1`.

So, every time the hour is even (e.g. 10:00, 12:00, 14:00), the `entry` is set to `1` for the row with the minute of the date equal to `0` (e.g. 10:00), and every time the hour is odd (e.g. 11:00, 13:00, 15:00), the `exit` is set to `1` for the row with the minute of the date equal to `0` (e.g. 11:00). This way, the `enter_long` and `exit_long` signals are generated only once per hour.