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# AGENTS.md
## Project Context
`miti99bot` is a Go Telegram bot with pluggable modules under
`internal/modules`. Runtime storage is MongoDB when `MONGO_URL` is set and
in-memory storage in tests. Read `README.md` before implementation work.
## Development Rules
- Keep changes scoped to the requested module or shared contract.
- Follow existing module patterns before adding abstractions.
- Use `rg` for code search.
- Use `gofmt` on changed Go files.
- Run focused tests for touched packages, then `go test ./...` and `go vet ./...`
for command, storage, migration, or shared behavior changes.
- Before committing code changes, run the CI lint gate locally with
`golangci-lint run` when the binary is available.
- Do not commit secrets, tokens, dotenv files, private keys, or production data.
## Command Changes
Telegram command names are user-facing contracts. When adding, renaming, or
deleting commands, update all related surfaces:
- module command registration in `internal/modules/<module>/`
- command parameter metadata used by Telegram and `/help`
- handler usage text and user-facing error text
- tests for registration, handlers, and command menu behavior
- README/docs when behavior changes are user-visible
Follow `docs/command-parameter-conventions.md` for all command parameter
metadata and usage text. Keep metadata, usage errors, examples, and tests exact.
Telegram's native menu and `/help` show command syntax plus the summary without
example invocations.
## Stats Compatibility
The `stats` module persists command usage in the `stats` collection. Command
name changes must preserve stats history.
- When renaming a command, add a one-time startup migration that moves stats
from the old command name to the new command name. Cover anonymous command
totals and per-user command rows. Guard the migration with the shared
`system` collection so it is idempotent.
- When deleting a command, do not delete its stats rows. Keep them as legacy
records and mark them with `deleted: true` in the stats document.
- Stats queries must filter legacy deleted rows from visible results. Apply the
filter consistently to top commands, top users, commands by user, users by
command, and username lookup paths for both MongoDB and in-memory stores.
- If adding a deleted marker or migration fields, update indexes if query
performance needs it and add tests for both startup migration and stats views.
- Legacy stats records are retained until the project owner decides to remove
them.
## Startup Migrations
Startup migrations should be safe to run every boot:
- create MongoDB indexes idempotently
- use `internal/systemstate` records in the shared `system` collection for
one-time migrations
- write tests for migration idempotency and legacy data handling
- after production data is verified migrated and the owner approves cleanup,
remove completed one-time migration runtime code and migration-only tests;
keep historical `system` marker records and legacy data unless the owner
explicitly asks to delete them
## Git
Use conventional commit messages without AI attribution. Keep commits focused;
split unrelated code, test, docs, and config changes when useful.