# Construction contractors: public directory using Next.js ## Summary A public directory blueprint for construction contractors built with Next.js on Ample. Domain schema: listings (reference, project_type, location, publishing_status, agency_id): showcase projects with publishing status; agencies (name, license_number, service_region): branches or divisions; vendors (name, trade, agency_id, prequalified): subcontractors and suppliers per branch; reports (agency_id, period, object_key, generated_at): branch progress reports; state_transitions (record_type, from_state, to_state): the allowed state machine. Public information: published project showcases, services and regions, licenses and insurance summary. Kept out of scope until handling is reviewed: site safety incidents, bid pricing, client contracts. Safety and bid data are confidential; only published showcases and branch reporting are modeled. Technical basis verified on Next.js: a workspace-scoped table, an explicit state machine (draft to review to published) that rejects invalid transitions, and a cross-workspace read that returns nothing (transitions=true isolation=true). ## Infrastructure requirements - Compute: verified (Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.) - Postgres: verified (Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.) - CDN: verified (The CDN host serves objects from published buckets. It does not front app compute and is not a cache or key-value store.) ## Prerequisites - A Next.js project (next build then next start -H 0.0.0.0 -p $PORT on the node-22 template) - A PostgreSQL driver reading DATABASE_URL (auto-provisioned when omitted) - Bucket credentials from `ample bucket create` passed as encrypted S3_* environment variables and a published bucket for public assets (CDN_*) - A review of which construction contractors data classes may be handled at all; this blueprint models public information only ## Exact tested configuration - template: `node-22` - runtime: `node` - size: `s-1vcpu-1gb` - install: `npm install` - build: `npm run build --if-present` - start: `npm run start` ## Steps 1. **Model the construction contractors domain.** Create the tables listings, agencies, vendors, reports, state_transitions. Showcase projects with publishing status live in listings; keep the sensitive classes (site safety incidents, bid pricing, client contracts) out of this schema. 2. **Workflow step 1.** Model listings with a publishing_status state machine scoped to the agency. 3. **Workflow step 2.** Serve only published listings, with media from the CDN bucket. 4. **Workflow step 3.** Enforce the agency scope on every query. 5. **Workflow step 4.** Deploy and verify a published listing and that unpublished listings are absent. 6. **Deploy.** Run the synchronous deploy once and read the result. Re-running with no change is a no-op. ``` ample deploy . --name --public --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=... --env CDN_PUBLIC_URL=... ``` 7. **Verify.** Run the pattern self-test(s) from the example (/p/relational-records) and your own acceptance checks for the construction contractors workflow. ``` ample logs --kind build ``` ## Tested examples - **Next.js pattern fixture** (tests/deploy-canaries/next-js-patterns): Verified relational records basis for this blueprint. ## Success checks - app responds on its public URL (`/` on the live URL, expect ample canary next js patterns) - relational-records self-test from the example (`/p/relational-records` on the live URL, expect see the pattern fixture checks) ## Limitations - The technical basis (relational records on Next.js) was verified with the pattern fixture; the construction contractors schema and workflow are an original design for this blueprint and were not executed as a separate application. - No health, financial, privacy or other compliance claim is made. Safety and bid data are confidential; only published showcases and branch reporting are modeled. - Public content and synthetic examples only until actual data-handling requirements have been reviewed. - Verified on the node-22 template at s-1vcpu-1gb; region, request-duration limits and other sizes are unknown or unverified. - Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified. - PutObject and GetObject with path-style addressing are verified; other S3 operations and CDN cache rules are not. ## Cost estimate Estimated 10.00 USD per month (size prices from pricing.toml at build revision a1b8c38919e59cd035ebabaced73cf84ece24371). - app server x1 `s-1vcpu-1gb`: 5.00 USD - managed PostgreSQL database x1 `s-1vcpu-1gb`: 5.00 USD Always-on monthly price of the tested sizes; apps and databases auto-pause when idle. Buckets are allocation-priced per quota and not included. ## Verification evidence - canary_run on 2026-09-21T02:34:39Z at revision `1d28ae0-dirty (CLI 0.1.21)`: Next.js pattern fixture deployed on Ample (next build then next start -H 0.0.0.0 -p $PORT on the node-22 template); the relational records checks passed: a workspace-scoped table, an explicit state machine (draft to review to published) that rejects invalid transitions, and a cross-workspace read that returns nothing (transitions=true isolation=true). The blueprint's Construction contractors schema and workflow below build on that verified basis and were not separately executed. (expires 2027-03-20T02:34:39Z) Last verified: 2026-09-21T02:34:39Z ## Execution binding MCP tool `ample_deploy` (registry `mcp:ample_deploy`), schema hash `876465fce906da0c` observed 2026-09-21T03:19:59.461917+00:00 at revision `49962bcade4f`, binding state `current`, required scopes: servers:write, databases:read, buckets:read.