Refactor platforms

[berekuk]

I did a few things here.

The key change is that all files in backend/platforms/ now conform to the Platform interface, which looks like this:

// fetcher should return null if platform failed to fetch forecasts for some reason
export type PlatformFetcher = () => Promise<Forecast[] | null>;

export interface Platform {
  name: string;
  fetcher: PlatformFetcher;
}

Note that fetcher doesn't store anything in the DB, it just returns the forecasts. And then processPlatform(platform) from backend/platforms/index.ts upserts it.

This way we can:

• avoid copy-paste
• do other stuff with fetchers other than update the DB (so fetchers are more pure in their side effects)
• standardize on the Platform interface so that we can evolve it in the future, e.g. add "longName" field, incremental updates, etc.

I also:

• renamed all-platforms.ts to index.ts; since it's the "main entry point to platforms", it makes sense to keep it in index
• removed platforms/all/platformFetchers.ts and platforms/all/platformNames.ts, they are not needed now
• removed -fetch suffix from platform files
• added a Forecast type (see platforms/index.ts) which is quite important for future type safety

This is the first step to my umbrella scheduler/platforms layer refactoring plan which I'll describe in a separate issue, and which adds more context about why I'm moving in this direction.

@NunoSempere, please let me know if you dislike any of this! One thing that this PR breaks is your pattern of "call a platform code by uncommenting a // polymarket(); line. But the same can be done with CLI, I think, so nothing significant is lost.

There are also a few minor details we could discuss, e.g. I know I could avoid an explicit name field in a Platform object and detect it with fun.name as it was done before; or at least use export default to avoid mentioning the platform name. There are some downsides to other approaches, though, some of them are too fragile to typos, and some are not compatible with typescript (e.g., it's impossible to specify a type when doing export default without creating an extra variable; also, export default is subtly worse than non-default exports, I believe).

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[berekuk]

(Forgot to push my last commit here which I described in the text above. Fixed.)

[NunoSempere]

Nice, looks good

[NunoSempere]

Mmh, actually, there are some merge conflicts, could you look into those? @berekuk. Probably a result of my refactoring polymarket's fetcher to take less memory yesterday.

[berekuk]

Oh right, I haven't merged your code yet. Just wanted to finish with #36 and other umbrella tasks, so pushed a bit early. Will fix soon.

[berekuk]

Merged.

I've also discovered that I broke down fun.name calls with anon callbacks, so I took the opportunity to rewrite CLI.

• jobs registry is now in backend/flow/jobs.ts, with unified "name, description & function" approach
• cli script code is simplified
• cli uses names instead of numbers
• added some color :)

[NunoSempere]

Overall looks good, though I left a few comments.

[berekuk]

Oh, I broke givewell and xrisk with this, since mergeEverything takes the data from the platforms list, and the list is missing those two. Don't merge this branch yet.

[berekuk]

Oh, I broke givewell and xrisk with this, since mergeEverything takes the data from the platforms list, and the list is missing those two.

But it's probably not the reason xrisk is missing from prod. Not sure what's up with that, updating manually, will comment on #39 soon.

[berekuk]

Oh, I broke givewell and xrisk with this, since mergeEverything takes the data from the platforms list, and the list is missing those two.

Fixed: I added xrisk and givewellopenphil platform descriptions.

Their fetchers are now responsible for reading input/filename.json instead of the old manualSendToDb.ts script, which I removed. I disabled the "read file and return" code in fetchers with early return, so it won't get executed every day in scheduler.

[berekuk]

Also: turns out I somewhat broke algolia updates in one of my previous PRs.

Here's how it happened:

• CLI script wasn't finishing properly due to node waiting for unfinished asyncs, and I couldn't find an easy way to check which async is guilty
• so I just threw in process.exit(); in commandLineUtility
• but rebuildAlgoliaDatabaseTheEasyWay wasn't awaiting for index.replaceAllObjects, and the npm run cli algolia exited before doing anything useful

I fixed this on this branch in 49d8140, and I'm not sure if this affected prod. Probably not, since in the scheduler job there are a few more steps after algolia, so algolia job had enough time to finish anyway.

Also, I moved algolia settings (app id and search key) to .env (NEXT_PUBLIC_ALGOLIA_SEARCH_KEY and NEXT_PUBLIC_ALGOLIA_APP_ID; already set up on Netlify to avoid issues with deployment).

[NunoSempere]

This should really be fixed.