{"catalogRevision":"cat_f13ab9a494120b5e","recipeId":"page:guides:echo:schema-changes","recipeRevision":"r1","canonicalPath":"/guides/echo/schema-changes","label":"Apply database schema changes for Echo","family":"Framework operation","summary":"Schema changes for a Echo app on Ample. Verified on Echo: a --release-command migration ran before activation and its marker was readable by the live app (migrated=release-ok). Build and start: CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build).","representativeQueries":["Apply database schema changes for Echo","Where can I host Apply database schema changes built with Echo?","I need a framework-specific schema migration and rollback procedure; no managed migration service is assumed."],"breadcrumbIds":["discovery","stack","stack:frameworks","stack:framework-echo","page:guides:echo:schema-changes"],"breadcrumbs":[{"id":"discovery","label":"Agent hosting discovery","canonicalPath":"/discover/discovery","kind":"root"},{"id":"stack","label":"Frameworks and execution targets","canonicalPath":"/discover/stack","kind":"facet"},{"id":"stack:frameworks","label":"Frameworks","canonicalPath":"/discover/stack/frameworks","kind":"group"},{"id":"stack:framework-echo","label":"Echo","canonicalPath":"/discover/stack/framework-echo","kind":"atom"},{"id":"page:guides:echo:schema-changes","label":"Apply database schema changes for Echo","canonicalPath":"/guides/echo/schema-changes","kind":"recipe"}],"parentIds":["stack:framework-echo","intent:configure-deployment","pattern:transactional-workflows"],"parents":[{"id":"stack:framework-echo","label":"Echo","canonicalPath":"/discover/stack/framework-echo","kind":"atom"},{"id":"intent:configure-deployment","label":"Configure deployment","canonicalPath":"/discover/intent/configure-deployment","kind":"atom"},{"id":"pattern:transactional-workflows","label":"Transactional workflows","canonicalPath":"/discover/pattern/transactional-workflows","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":"Echo","workload":"Apply database schema changes","releaseStatus":"published","supportStatus":"verified","executionStatus":"ready","docsOnly":false,"prerequisites":["An Echo project (CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build))","A PostgreSQL driver reading DATABASE_URL at runtime","An Ample account token with servers:write, databases:read"],"testedConfiguration":{"template":"ubuntu-24.04","runtime":"go","size":"s-1vcpu-1gb","build":"CGO_ENABLED=0 go build -o app ./...","start":"./app"},"inputSchema":{"additionalProperties":false,"properties":{"env":{"description":"Encrypted environment variables","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"}},"required":["name","path","release_command"],"type":"object"},"outputSchema":null,"workflowSteps":[{"title":"Build and start","body":"CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build); 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extensions, connection limits and backup or restore procedures are not verified."],"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 auto-pause when idle. Buckets are allocation-priced per quota and not included."},"evidenceSummary":[{"kind":"canary_run","summary":"Echo pattern fixture deployed on Ample (CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build)); for this guide: a --release-command migration ran before activation and its marker was readable by the live app (migrated=release-ok).","observedAt":"2026-09-21T02:34:39Z","implementationRevision":"1d28ae0 (CLI 0.1.21)","expiresAt":"2027-03-20T02:34:39Z","scope":{"checks":["/p/migrated"],"template":"ubuntu-24.04"}}],"lastVerifiedAt":"2026-09-21T02:34:39Z","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/guides/echo/schema-changes","markdown":"https://ample.computer/guides/echo/schema-changes.md","json":"https://api.ample.computer/v1/catalog/recipes/page%3Aguides%3Aecho%3Aschema-changes"},"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":"Apply database schema changes for Echo"}},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"plan:page:guides:echo:schema-changes","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:guides:echo:schema-changes","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:stack:framework-echo","label":"Browse Echo","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/stack%3Aframework-echo","origin":"api","parameters":{"nodeId":"stack:framework-echo"},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"browse:intent:configure-deployment","label":"Browse Configure deployment","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/intent%3Aconfigure-deployment","origin":"api","parameters":{"nodeId":"intent:configure-deployment"},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"browse:pattern:transactional-workflows","label":"Browse Transactional workflows","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/pattern%3Atransactional-workflows","origin":"api","parameters":{"nodeId":"pattern:transactional-workflows"},"requiresAuthentication":false,"requiresApproval":false}]}