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feat: pre-generate watermarks for instant lightbox loading

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Previously watermarks were applied on-the-fly when viewing photos in the
lightbox, causing 1+ minute load times for high-resolution images.

This change pre-generates watermarked versions during upload and when
watermark settings change, enabling instant image loading (~50-100ms).

- Add database migration for watermark_path tracking (061)
- Add watermarkGeneratorService for batch operations
- Extend watermarkService with save-to-disk capability
- Modify gallery endpoint to serve pre-generated files
- Add background regeneration when branding settings change
- Add npm script for migrating existing photos

Closes #112
This commit is contained in:
Paul Nothaft
2026-01-15 21:00:10 +01:00
parent d29aab7c70
commit 1be974afbb
9 changed files with 854 additions and 8 deletions
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backend/migrations/README.md
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@@ -1,6 +1,6 @@
# Database Migrations
This directory contains database migrations for the Wedding Photo Sharing platform.
This directory contains database migrations for the PicPeak photo sharing platform.
## Directory Structure
@@ -9,6 +9,7 @@ Essential migrations that are always run for new deployments. These include:
- `init.js` - Initial database schema creation
- Backup service tables (029-035)
- Gallery feedback tables (033)
- Pre-generated watermarks (061)
### `/legacy`
Migrations needed only when upgrading from older versions. New deployments can skip these as the core schema already includes all necessary tables and columns.