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Build me a social media scheduler I run myself, for the networks whose APIs are actually open.

STACK
- Node with Fastify, SQLite via better-sqlite3, server-rendered HTML
- One cron-driven worker

COMPOSING
- Write one post, pick target channels, attach images
- Publish now, or schedule for a UTC timestamp
- Per-network character and media validation before a post can be queued, never after it fails

ADAPTERS
- A common interface with publish(), validate() and characterLimit()
- Mastodon and Bluesky implemented, since their APIs are open
- A documented stub showing exactly where an X or LinkedIn adapter would slot in, and what it would cost

THE QUEUE
- Every scheduled post stored append-only
- A separate attempts table recording each publish attempt, its response and its error, so a failure is diagnosable weeks later
- Exponential-backoff retries, a dead-letter state, and a visible failed queue

VIEWS
- A calendar of the next 30 days, and a list of what already went out with permalinks

TOKENS
- OAuth tokens encrypted at rest with a key from the environment
- A clear screen when one expires, rather than posts silently failing

Include a README covering application registration on each network and the review each one requires.