feat: leafwatch worker

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What does this PR do?

🤖 Generated by Copilot at 63285c1

This pull request adds a new package for the leafwatch worker, which is a Cloudflare Worker that interacts with a PostgreSQL database. The package contains the TypeScript code, configuration files, and documentation for the worker. The worker has two handlers: one for creating the database table for events, and one for ingesting events from the web application. The worker uses the pg, itty-router, and @cloudflare/workers-types modules, and the wrangler tool. The pull request also updates the pnpm-lock.yaml file with the new dependencies.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 63285c1

• Add a leafwatch worker package that handles requests to ingest events from the web application and create tables in the PostgreSQL database (link-link)
• Create a package.json file that specifies the package metadata and dependencies (link)
• Create a wrangler.toml file that configures the wrangler tool for deploying and developing the worker (link)
• Create a .eslintrc.js file that configures the linting rules for the TypeScript code (link)
• Create a tsconfig.json file that configures the TypeScript compiler for the worker (link)
• Create a README.md file that provides a brief title for the package (link)
• Create a .dev.vars.example file that stores the database URL and the secret key for the worker (link)
• Create a src folder that contains the source code for the worker (link-link)
  • Create an index.ts file that exports the main fetch function that handles the incoming requests to the worker (link)
  • Create a types.ts file that exports the interface for the environment variables for the worker (link)
  • Create a handlers folder that contains the handlers for the different routes of the worker (link-link)
    • Create a createTables.ts file that exports the handler for the /createTables route that initializes the database schema (link)
    • Create an ingest.ts file that exports the handler for the /ingest route that inserts events into the database (link)
  • Create a helpers folder that contains the helper function for validating the request body (link)
    • Create a keysValidator.ts file that exports the function that checks the required keys in the request body (link)
• Update the pnpm-lock.yaml file to lock the dependency tree for the monorepo and add the dependencies for the leafwatch worker package (link,link,link,link,link,link,link)
  • Add a section for the leafwatch worker package that lists its dependencies and devDependencies (link)
  • Add sections for the @types/pg, buffer-writer, obuf, packet-reader, pg-cloudflare, postgres-array, postgres-bytea, postgres-date, postgres-interval, and postgres-range packages that list their resolutions, dependencies, and flags (link,link,link,link,link,link)

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