Fix several bugs in the database

[alikia2x]

We have identified several critical issues within the database that need to be resolved to ensure data integrity and accuracy.

Problems

1. A significant number of songs have a published_at date set to the year of 1970.
2. Metadata tags are missing for the videos published in the period from March 2 to March 22, which may lead to inaccurate labeling.
3. The songs table may contain a large number of entries classified as type 0 (non-music videos).
4. Most of the videos are missing the metadata column cover_url that need to be complemented.

Tasks

• Investigate and fix the published_at date issue for affected songs.
• Review and restore missing metadata tags for the specified date range.
• Clean up the songs table to remove or correct entries with type 0.
• Identify and add missing video covers where applicable.