Fix hardcoded 5% analytics growth across all providers

[tcpsyn]

Summary

• The percentageChange field in analytics data was hardcoded to 5 in five social media providers (X/Twitter, Facebook, LinkedIn Page, Instagram, Threads), causing the analytics dashboard to always display a fake 5% growth indicator regardless of actual data
• Added a shared calculatePercentageChange() utility function that computes real percentage change by comparing the first half vs second half of time-series data
• Applied the utility across all affected providers; metrics with only aggregated/total values (no time series) correctly return 0 instead of a misleading number

Affected Providers

Provider	Lines Changed	Fix
X (Twitter)	x.provider.ts	Was percentageChange: 5 → now calculated from metric data
Facebook	facebook.provider.ts	Was percentageChange: 5 → now calculated from daily insights
LinkedIn Page	linkedin.page.provider.ts	Was percentageChange: 5 → now calculated from page analytics
Instagram	instagram.provider.ts	Was percentageChange: 5 in 2 places → calculated for time-series, 0 for aggregates
Threads	threads.provider.ts	Was percentageChange: 5 → calculated for daily data, 0 for total_value

New File

libraries/nestjs-libraries/src/integrations/social/analytics.utils.ts — shared utility that:

• Splits data array at midpoint into first/second half
• Sums totals for each half (handles both string and number values)
• Returns ((secondHalfSum - firstHalfSum) / firstHalfSum) * 100, rounded to 1 decimal
• Returns 0 for edge cases (< 2 data points, zero first-half sum)

Test plan

• Verified fix on a self-hosted Postiz instance with connected social accounts
• Analytics dashboard shows real percentage changes instead of 5% across all platforms
• Providers with aggregate-only data (no time series) correctly show 0% instead of fake growth
• No changes to posting, scheduling, or any other functionality

🤖 Generated with Claude Code

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