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Alkemio Server

Welcome to the Alkemio Server! This server is the heart of the Alkemio Platform, and manages the representation of the Space and all the entities stored wthin it.

A high level overview of the Design of the Alkemio Server is shown below.

The server primarily interacts via a GraphQL api' that it exposes. This can be found at the following location: http://localhost:4000/graphql (assuming default port).

This api is used by the Alkemio Web Client, but also by any other clients / integrations that need to interact with the Alkemio server.

The key takeaway is that the Alkemio server is designed to be integrated, so that other tools or user interfaces can make use of the logical domain model maintained by the server.

Additional information:

• Design - An overview of architectural layers and technologies used
• Running - How to run the Server using containers (docker-compose and docker)
• Developing - How to setup the Server for developing
• Data Management - How data representing the domain model used by Alkemio Platform is managed, including database migrations
• Quality Assurance - Details of the test harness around the server and how to execute the test suites.
• Pushing - How new docker images are published to Dockerhub
• Database definitions - Guidelines for creating TypeORM entity definitions

For other questions / comments please feel free to reach out via the channels listed in the Alkemio Repo or via Alkemio organization.

GraphQL Schema Contract Governance

The GraphQL schema is treated as a stable contract. Every schema-affecting change is diffed against the committed canonical snapshot (schema.graphql) using an automated toolchain (Feature 002: Schema Contract Diffing & Enforcement).

Key points:

• Deterministic snapshot: npm run schema:print (+ optional npm run schema:sort) produces a canonical schema.graphql.
• Change classification: Diffs produce change-report.json categorizing entries as ADDITIVE, DEPRECATED, DEPRECATION_GRACE, INVALID_DEPRECATION_FORMAT, BREAKING, PREMATURE_REMOVAL, INFO, or BASELINE.
• Deprecation lifecycle: Deprecations must use the format REMOVE_AFTER=YYYY-MM-DD | reason. A 90‑day minimum window applies to removals (fields + enum values). Missing schedule initially yields a 24h DEPRECATION_GRACE warning.
• Overrides: Intentional breaking changes require a CODEOWNER GitHub review containing the phrase BREAKING-APPROVED. Approved entries show overrideApplied and pass the gate.
• CI gate: Unapproved BREAKING, PREMATURE_REMOVAL, or INVALID_DEPRECATION_FORMAT changes fail the schema-contract workflow.
• Performance budget: Large schema diff executes in <5s (enforced by perf test).

Developer workflow summary:

1. Update code.
2. Regenerate snapshot (npm run schema:print && npm run schema:sort).
3. Fetch prior snapshot (from base branch) and run diff (npm run schema:diff).
4. Review classifications; if intentional breaking, secure CODEOWNER approval with phrase.
5. Commit updated schema.graphql only.

See specs/002-schema-contract-diffing/quickstart.md for full instructions, troubleshooting, and classification glossary.

CLI Quick Reference (Schema Contract Tooling)

Core scripts (all TypeScript runners use ts-node + path mapping):

Intent	Command	Notes
Print current schema	npm run schema:print	Generates schema.graphql (lightweight bootstrap under env SCHEMA_BOOTSTRAP_LIGHT=1)
Canonical sort	npm run schema:sort	Stable lexicographic ordering (idempotent)
Diff vs previous	npm run schema:diff	Requires tmp/prev.schema.graphql (empty => baseline) writes change-report.json & deprecations.json
Validate artifacts	npm run schema:validate	Ajv validation against JSON Schemas

Governance environment variables:

Variable	Purpose
SCHEMA_BOOTSTRAP_LIGHT	When 1, uses lightweight module for faster printing (parity enforced by tests)
SCHEMA_OVERRIDE_CODEOWNERS_PATH	Alternate path to CODEOWNERS file
SCHEMA_OVERRIDE_REVIEWS_JSON	Inline JSON array of review objects ([{reviewer, body, state}])
SCHEMA_OVERRIDE_REVIEWS_FILE	Path to file containing JSON reviews array

Override approval phrase: BREAKING-APPROVED (must appear in APPROVED review body by a CODEOWNER reviewer). Applies to BREAKING entries only; sets overrideApplied=true and per-entry override=true so gate treats them as informational.

Exit codes (schema gate):

Code	Meaning	Blocking Condition
0	Success	No unapproved blocking classifications
1	BREAKING	One or more BREAKING entries without override
2	PREMATURE_REMOVAL	Removal attempted before lifecycle conditions met
3	INVALID_DEPRECATION_FORMAT	Malformed or missing removal schedule after grace period

Performance budgets: diff <5s on synthetic 250+ type schema; cold bootstrap <2s (enforced by automated tests).

Schema gate runner flags

The CI runner script .github/workflows/scripts/schema-gate.ts accepts a small CLI:

• --path=<file> (or positional <file>): path to the change report JSON (defaults to change-report.json).
• --fail / --no-fail: boolean toggle to make the script exit non-zero on detected violations.

Per-entry overrides are honored via the override boolean on change entries. INVALID_DEPRECATION_FORMAT entries are treated as warnings (non-blocking) by default; this behavior can be changed if desired in the script.

For deeper glossary, lifecycle rules, simulation of overrides, troubleshooting, see the Quickstart.