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[ShaneIsrael]

This pull request introduces a database migration and supporting code changes to ensure that each video can only be linked to a particular game once, removing any existing duplicate links. It also updates the video player's UI by customizing the overlay gradient and cleans up related CSS. The version is bumped to 1.6.9 to reflect these updates.

Database integrity improvements:

• Adds a unique constraint to the video_game_link table on the combination of video_id and game_id, ensuring no duplicate links between a video and a game. Existing duplicates are removed in the migration (migrations/versions/n9i0j1k2l3m4_unique_video_game_link.py, app/server/fireshare/models.py). [1] [2]
• Updates the video scanning logic to check for an existing link before creating a new VideoGameLink, preventing duplicate entries at the application level (app/server/fireshare/cli.py).

Video player UI enhancements:

• Adds a new CSS file, videoSkinOverrides.css, to constrain the video player's controls overlay gradient to the bottom 25% of the video, improving visual clarity (app/client/src/components/player/videoSkinOverrides.css, app/client/src/components/player/VideoJSPlayer.js). [1] [2]
• Removes obsolete CSS that previously hid the overlay gradient (app/client/src/index.css).

Version update:

• Bumps the application version from 1.6.8 to 1.6.9 in package.json and package-lock.json to reflect these changes (app/client/package.json, app/client/package-lock.json). [1] [2]