## Bug description

The grouped-by-month view in charts is hella confusing. The x-axis shows a date that does not reflect the value on the y-axis.

1. the y-axis shows the number for the END of the month
2. the x-axis reads as "beginning of the month"

![CleanShot 2024-02-05 at 10 23 30@2x](https://github.com/PostHog/posthog/assets/35429197/d78df745-8319-4b78-95fa-d96f18aee357)

### Comparison with daily grouping

Compare the "group by month" view with "group by day". The x-axis labeling aligns with the y-axis values. 

![CleanShot 2024-02-05 at 10 29 20@2x](https://github.com/PostHog/posthog/assets/35429197/998825fa-7406-4214-8310-8f173980f80c)


## How to reproduce

1. Group a chart by month 
2. select "unique events"

## Proposal 

### 1. easy fix - remove the "1." from the labelling

- will still confuse readers with "is this the beginning or end of the month"

![CleanShot 2024-02-05 at 10 23 30@2x](https://github.com/PostHog/posthog/assets/35429197/1a0ae6d4-0e02-4b32-86ab-7b0e069655ed)

### 2. correct fix - show end of month

- removes ambiguity from "is that the beginning or end of month"
- harder to implement because months have different end days

![CleanShot 2024-02-05 at 10 23 30@2x](https://github.com/PostHog/posthog/assets/35429197/61226346-7f97-4bcd-87bf-53fc83c75245)


cc @jannesblobel
posthog/hogql_queries/insights/lifecycle_query_runner.py
date_to = self.query_date_range.date_to()
        interval = self.query_date_range.interval_name
        return is_stale(self.team, date_to, interval, cached_result_package)
    def _refresh_frequency(self):
        date_to = self.query_date_range.date_to()
        date_from = self.query_date_range.date_from()
        interval = self.query_date_range.interval_name
        delta_days: Optional[int] = None
        if date_from and date_to:
            delta = date_to - date_from
            delta_days = ceil(delta.total_seconds() / timedelta(days=1).total_seconds())
        refresh_frequency = BASE_MINIMUM_INSIGHT_REFRESH_INTERVAL
        if interval == "hour" or (delta_days is not None and delta_days <= 7):
            
            refresh_frequency = REDUCED_MINIMUM_INSIGHT_REFRESH_INTERVAL
        return refresh_frequency