{"catalogRevision":"cat_f13ab9a494120b5e","recipeId":"page:recipes:graphql-api:fastapi:persistent-state","recipeRevision":"r1","canonicalPath":"/recipes/graphql-api/fastapi/persistent-state","label":"Host graphql api with FastAPI: Postgres-backed state","family":"Workload recipe","summary":"Deploy a graphql api built with FastAPI on Ample using the durable job state pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL. Verified on FastAPI: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Not separately tested: your job types, payload schema and retry policy; treat the graphql api-specific behavior as your application code.","representativeQueries":["Host graphql api with FastAPI: Postgres-backed state","Where can I host GraphQL API built with FastAPI?","I need a durable state schema and retry/recovery semantics implemented by application code."],"breadcrumbIds":["discovery","workload","workload:agents-and-backends","workload:graphql-api","page:recipes:graphql-api:fastapi:persistent-state"],"breadcrumbs":[{"id":"discovery","label":"Agent hosting discovery","canonicalPath":"/discover/discovery","kind":"root"},{"id":"workload","label":"Applications and workloads","canonicalPath":"/discover/workload","kind":"facet"},{"id":"workload:agents-and-backends","label":"Agents and backends","canonicalPath":"/discover/workload/agents-and-backends","kind":"group"},{"id":"workload:graphql-api","label":"GraphQL API","canonicalPath":"/discover/workload/graphql-api","kind":"atom"},{"id":"page:recipes:graphql-api:fastapi:persistent-state","label":"Host graphql api with FastAPI: Postgres-backed state","canonicalPath":"/recipes/graphql-api/fastapi/persistent-state","kind":"recipe"}],"parentIds":["workload:graphql-api","stack:framework-fastapi","pattern:durable-job-state","intent:deploy-api"],"parents":[{"id":"workload:graphql-api","label":"GraphQL API","canonicalPath":"/discover/workload/graphql-api","kind":"atom"},{"id":"stack:framework-fastapi","label":"FastAPI","canonicalPath":"/discover/stack/framework-fastapi","kind":"atom"},{"id":"pattern:durable-job-state","label":"Durable job state","canonicalPath":"/discover/pattern/durable-job-state","kind":"atom"},{"id":"intent:deploy-api","label":"Deploy API","canonicalPath":"/discover/intent/deploy-api","kind":"atom"}],"resourceRequirements":["primitive:compute","primitive:postgres"],"infrastructureRequirements":[{"primitiveId":"primitive:compute","label":"Compute","canonicalPath":"/discover/primitive/compute","status":"verified","summary":"Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes."},{"primitiveId":"primitive:postgres","label":"Postgres","canonicalPath":"/discover/primitive/postgres","status":"verified","summary":"Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied."}],"framework":"FastAPI","workload":"GraphQL API","releaseStatus":"published","supportStatus":"verified","executionStatus":"ready","docsOnly":false,"prerequisites":["A FastAPI project that builds and starts with the documented commands (pip install into .ample/python from requirements.txt, then uvicorn from run.py reading PORT on the python-3.12 template)","A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env)","An Ample account token with servers:write, databases:read"],"testedConfiguration":{"template":"python-3.12","runtime":"python","size":"s-1vcpu-1gb","install":"python3 -m pip install --target .ample/python -r requirements.txt","start":"PYTHONPATH=.ample/python:${PYTHONPATH:-} python3 run.py"},"inputSchema":{"additionalProperties":false,"properties":{"env":{"description":"Encrypted environment variables (bucket credentials, secrets)","items":{"pattern":"^[A-Z][A-Z0-9_]*=.*$","type":"string"},"maxItems":50,"type":"array"},"name":{"description":"App name","maxLength":63,"minLength":1,"pattern":"^[a-z0-9-]+$","type":"string"},"path":{"description":"Project directory or ample.toml service","maxLength":512,"minLength":1,"type":"string"},"release_command":{"description":"Migration command run before activation","maxLength":512,"type":"string"},"start":{"description":"Start command (Python apps pass one explicitly)","maxLength":512,"type":"string"}},"required":["name","path","start"],"type":"object"},"outputSchema":null,"workflowSteps":[{"title":"Build and start","body":"pip install into .ample/python from requirements.txt, then uvicorn from run.py reading PORT on the python-3.12 template. The server must bind 0.0.0.0 on PORT."},{"title":"Implement the pattern on PostgreSQL","body":"The fixture's module implements durable job state: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Copy the approach into your schema; keep migrations idempotent and run them with --release-command."},{"title":"Deploy","body":"Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.","command":"ample deploy . --name <app-name> --public --start \"python3 run.py\""},{"title":"Verify","body":"Fetch the live URL and the pattern self-test route(s) (/p/durable-job-state) from the example; then run your own checks. On failure read `ample logs <deployment_id> --kind build` then `--kind runtime`.","command":"ample logs <deployment_id> --kind build"}],"examples":[{"title":"FastAPI pattern fixture","description":"Multi-pattern FastAPI app whose durable job state module was checked live; the module is under tests/deploy-canaries/_pattern-modules.","sourceRef":"tests/deploy-canaries/fastapi-patterns"}],"successChecks":[{"description":"app responds on its public URL","kind":"http_get","path":"/","expect":"ample canary fastapi patterns"},{"description":"durable-job-state self-test","kind":"http_get","path":"/p/durable-job-state","expect":"job=done attempts=1 idempotent=true"}],"limitations":["Verified on the python-3.12 template at s-1vcpu-1gb with the example fixture; other sizes, templates and FastAPI major versions are not verified.","The graphql api itself (your job types, payload schema and retry policy) is application code and was not separately tested; the pattern checks are what was verified.","Region, compliance attestations and request-duration limits are unknown and not claimed.","Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.","Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified; apps and their databases are placed together."],"costEstimate":{"currency":"USD","monthlyAmount":10.0,"authoritative":true,"basis":"size prices from pricing.toml (loaded by the API) at build revision 7cf090725a6f16dd91af7d28356fe72c1b404d6e","components":[{"name":"app server","size":"s-1vcpu-1gb","quantity":1.0,"monthlyAmount":5.0},{"name":"managed PostgreSQL database","size":"s-1vcpu-1gb","quantity":1.0,"monthlyAmount":5.0}],"note":"Always-on monthly price of the tested sizes; apps and databases auto-pause when idle. Buckets are allocation-priced per quota and not included."},"evidenceSummary":[{"kind":"canary_run","summary":"FastAPI pattern fixture deployed on Ample (pip install into .ample/python from requirements.txt, then uvicorn from run.py reading PORT on the python-3.12 template); checks passed for durable-job-state and configuration-secrets. Pattern proof: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true).","observedAt":"2026-09-21T01:14:18Z","implementationRevision":"50dbac567d2c5cc8e55e6c748a646be0025d9cfb (CLI 0.1.21)","expiresAt":"2027-03-20T01:14:18Z","scope":{"checks":["/p/durable-job-state"],"pattern":"pattern:durable-job-state","template":"python-3.12"}},{"kind":"canary_run","summary":"The same FastAPI app deployed with a --release-command migration; the marker it created was readable after activation.","observedAt":"2026-09-20T01:54:51Z","implementationRevision":"199ff1dfd52683832ae75d3f98b53a7a4bff7f96 (CLI e3181f5)","expiresAt":"2027-03-19T01:54:51Z","scope":{"pattern":"pattern:durable-job-state"}}],"lastVerifiedAt":"2026-09-21T01:14:18Z","mcpBinding":{"registryRef":"mcp:ample_deploy","toolName":"ample_deploy","schemaHash":"876465fce906da0c224d62961d3343064108ebe30af80cf1b87094974e948853","observedAt":"2026-09-22T00:31:22.774679+00:00","implementationRevision":"e6446ceea69b","requiredScopes":["servers:write","databases:read"],"bindingState":"current"},"unknowns":["region availability is unknown until a verified region fact is recorded","compliance attestations are unknown; none are claimed"],"formats":{"html":"https://ample.computer/recipes/graphql-api/fastapi/persistent-state","markdown":"https://ample.computer/recipes/graphql-api/fastapi/persistent-state.md","json":"https://api.ample.computer/v1/catalog/recipes/page%3Arecipes%3Agraphql-api%3Afastapi%3Apersistent-state"},"nextActions":[{"actionId":"browse-catalog","label":"Browse the catalog index","operationId":"catalog_index","method":"GET","relativePath":"/v1/catalog","origin":"api","parameters":{},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"search-recipes","label":"Search published recipes by intent, stack and constraints","operationId":"search_recipes","method":"POST","relativePath":"/v1/catalog/search","origin":"api","parameters":{"body":{"limit":5,"query":"Host graphql api with FastAPI: Postgres-backed state"}},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"plan:page:recipes:graphql-api:fastapi:persistent-state","label":"Prepare a side-effect-free deployment plan for an authorized project","operationId":"plan_deployment","method":"POST","relativePath":"/v1/catalog/plan","origin":"api","parameters":{"body":{"inputs":{},"projectId":"<workspace or server id you own>","recipeId":"page:recipes:graphql-api:fastapi:persistent-state","recipeRevision":"r1"}},"requiresAuthentication":true,"requiresApproval":false},{"actionId":"auth-setup","label":"Read the existing agent authentication setup","operationId":"existing_auth_setup","method":"GET","relativePath":"/mcp/setup","origin":"api","parameters":{},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"browse:workload:graphql-api","label":"Browse GraphQL API","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/workload%3Agraphql-api","origin":"api","parameters":{"nodeId":"workload:graphql-api"},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"browse:stack:framework-fastapi","label":"Browse FastAPI","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/stack%3Aframework-fastapi","origin":"api","parameters":{"nodeId":"stack:framework-fastapi"},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"browse:pattern:durable-job-state","label":"Browse Durable job state","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/pattern%3Adurable-job-state","origin":"api","parameters":{"nodeId":"pattern:durable-job-state"},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"browse:intent:deploy-api","label":"Browse Deploy API","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/intent%3Adeploy-api","origin":"api","parameters":{"nodeId":"intent:deploy-api"},"requiresAuthentication":false,"requiresApproval":false}]}