{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp09_archetype_breadth150_20260804","cell_id":"constraint_envelope_adjustment__computer_science","arm":"BREADTH_PROBE_ONE_SHOT","candidate_id":"constraint_envelope_adjustment__computer_science__P1","proposal_index":1,"version":0,"title":"Risk-Shaped Execution Envelope for Production Database Migrations","problem":"A deployment system treats a database migration as a binary approved-or-rejected artifact. Once approved, the migration runner permits materially different actions—additive changes, long-lock operations, destructive changes, and irreversible mixed-version changes—inside the same execution envelope. This envelope is too broad for hazardous operations yet can become too narrow when teams respond with blanket migration freezes that also block staged, reversible schema evolution.","actors":["Application teams authoring schema migrations","Database reliability engineers responsible for production integrity","The deployment orchestrator and migration runner","Service operators handling deployment failures","Tenants whose workloads share the affected database"],"observable_state":"The problem is observable when an approved migration can execute operations with different lock duration, reversibility, compatibility, and data-loss characteristics without operation-specific constraints, while incident-driven freezes or manual gates also delay migrations that could run as additive, staged, and reversible sequences. Deployment logs, migration plans, lock estimates, rollback records, and mixed-version compatibility checks expose the relevant state.","consequence":"A permitted migration can acquire disruptive locks, remove data needed by an older application version, or leave the database and application mutually incompatible. Conversely, blanket restrictions can prevent teams from making low-risk additive changes needed to evolve services, shifting work into manual exceptions and untracked workarounds.","affected_objective":"Preserve production availability and data integrity while retaining the ability to evolve database schemas safely.","intervention":"Replace the binary migration permission with an explicit, enforceable execution envelope based on operation shape and deployment phase. Permit additive, backward-compatible operations directly; require expand-migrate-contract sequencing for destructive or narrowing changes; prohibit direct execution of operations that exceed declared lock, reversibility, or mixed-version compatibility bounds; and provide a time-bounded, audited waiver for exceptional cases with named ownership, enhanced monitoring, and automatic abort conditions. Review the envelope from observed blocked-beneficial-action and escaped-hazard signals rather than allowing restrictions to accumulate indefinitely.","structural_mapping":[{"archetype_element":"Identifiable constraint envelope","domain_realization":"The set of schema operations, operation sequences, lock exposures, compatibility states, and exception paths the migration runner will execute."},{"archetype_element":"Misaligned permissible action space","domain_realization":"Binary approval gives hazardous and additive operations the same post-approval freedom, while blanket freezes suppress both."},{"archetype_element":"Boundary and threshold","domain_realization":"Operation class, expected lock exposure, reversibility, backward compatibility, deployment phase, and table criticality determine whether execution is permitted, staged, waived, or denied."},{"archetype_element":"Margin of safety","domain_realization":"The application and schema must remain compatible across the concurrently deployed software versions, and destructive contraction waits until old readers and writers are absent."},{"archetype_element":"Monitoring and feedback","domain_realization":"The system records prohibited operations, waivers, aborts, lock exposure, rollback failures, and safe migrations blocked by the policy."},{"archetype_element":"Adjustment rule","domain_realization":"A governed review can tighten an operation class after an escaped hazard or relax it after repeated evidence of safe blockage, subject to protected compatibility and integrity bounds."},{"archetype_element":"Rollback or revision path","domain_realization":"The envelope evaluator can be disabled for the pilot scope, individual rules can revert to report-only mode, and the existing approval workflow remains available."}],"mechanism_mapping":[{"mechanism_slug":"workflow_permission_or_approval_rule_change","role":"Changes migration approval from a single artifact-level decision into enforceable permissions for particular operations and sequences.","counterfactual_removal":"Without this move, approval would still expose the same broad execution space, leaving the intervention as advice or linting."},{"mechanism_slug":"operating_limit_recalibration","role":"Places distinct execution bounds on lock exposure, reversibility, compatibility, and destructive operations according to migration context.","counterfactual_removal":"Without operation-specific bounds, the system could classify migrations but could not prevent an approved deployment from crossing the relevant viability boundary."},{"mechanism_slug":"waiver_with_monitoring","role":"Retains bounded adaptive capacity for exceptional migrations while attaching ownership, expiry, telemetry, and abort conditions.","counterfactual_removal":"Without a monitored exception path, tightening could become a brittle blanket prohibition or drive operators to bypass enforcement."}],"causal_chain":["Binary approval leaves the post-approval migration action space poorly shaped.","Hazardous and low-risk operations therefore receive insufficiently differentiated constraints.","The migration runner replaces binary permission with operation- and sequence-specific execution bounds.","Authors restructure hazardous direct changes into permitted expand-migrate-contract phases or request a bounded waiver.","Changed feasibility prevents disallowed operation shapes from executing while preserving explicitly bounded paths for additive and exceptional work.","Monitoring reveals escaped hazards, blocked beneficial migrations, gaming, and displaced manual work.","Authorized reviewers revise or roll back individual boundaries while preserving compatibility, integrity, and auditability invariants."],"baseline":"The baseline is ordinary code review plus a binary migration approval, supplemented by static checks, operator judgment, and occasional blanket freezes. It can identify suspicious migrations but does not continuously define and enforce a differentiated permissible space across operation type, deployment phase, compatibility state, and exception conditions.","nearest_rivals":["A SQL migration linter flags prohibited syntax or patterns but need not reshape the permitted multi-stage workflow or govern conditional exceptions.","Manual database-administrator approval can make case-by-case decisions but does not itself create a legible, consistently enforced, revisable execution envelope.","A canary application deployment limits software exposure but may not contain a schema operation applied to a shared database.","Migration rate limiting restricts execution frequency or concurrency, whereas the proposed envelope governs operation shape, sequencing, reversibility, compatibility, and exceptions.","A blanket ban on destructive migrations narrows the space without restoring a governed staged path or monitoring overconstraint."],"remaining_contrastive_claim":"The candidate's distinguishing claim is that migration risk and evolvability should be addressed by reshaping the set and sequence of executable schema actions—not merely by reviewing harder, slowing migrations, detecting bad syntax, or banning a single operation category.","authority_safety":{"decision_authority":"The database platform owner may define runner constraints only for databases and deployment workflows under its operational mandate; service owners and data stewards must approve rules affecting application compatibility or data-retention obligations.","authorized_first_step":"Run a report-only evaluation against historical migration plans and an isolated database replay; do not alter production execution permissions.","excluded_actions":["Executing experimental rules against production migrations","Automatically granting waivers","Deleting or transforming production data","Changing retention, privacy, or legal obligations","Extending the envelope to databases outside the participating owners' mandate","Using short-term incident counts alone to ratchet restrictions"],"halt_rollback":"Halt if replay causes data mutation outside the isolated target, if required plan metadata cannot be obtained safely, or if the evaluator cannot explain each classification. Delete the isolated replay state through the approved test-environment process and revert all pilot rules to report-only or disabled status."},"negative_tests":{"strongest_counterevidence":"Historical failures and near misses cluster around faulty application logic, capacity deficits, or operator execution errors that remain equally possible under every proposed migration envelope, while operation shape and sequencing show no useful relation to the failures.","problem_falsifier":"Inspection shows that the current runner already enforces differentiated, explicit, revisable bounds for operation class, sequencing, compatibility, reversibility, and exceptions, or that migrations cannot be intercepted before execution.","intervention_falsifier":"In isolated replay, the envelope fails to block predefined hazardous operation sequences, cannot distinguish staged compatible changes from their direct destructive equivalents, or blocks an unacceptable share of migrations judged safe under the protected invariants without producing actionable reasons.","risks":["Overconstraint could delay legitimate schema evolution and emergency repair.","Underconstraint could preserve a hazardous path while creating false assurance.","Teams could game classifications by splitting or disguising operations.","Hazard could be displaced into ungoverned application code, manual SQL, or data backfills.","Lock and compatibility estimates may be wrong or unavailable.","Waivers could become the routine path and defeat the envelope.","Constraint creep could accumulate rules after incidents without removing obsolete restrictions.","Differentiated rules could burden smaller service teams unevenly.","A centralized envelope could reduce adaptive capacity during novel incidents.","Oscillatory tightening and relaxation could make deployment behavior unpredictable."]},"next_evidence_step":"Select a bounded set of 30 completed migrations from one consenting service, including additive, staged, destructive, and previously remediated cases. In an isolated database copy, run the proposed evaluator in report-only mode and replay plans without production traffic. Before evaluation, have the database owner label the invariant-relevant operation sequences and specify acceptable classifications. Record hazardous sequences blocked, safe sequences blocked, explanation completeness, required waivers, and any hazard displaced outside the runner. Stop after the 30 cases and decide only whether a small non-production prospective pilot is warranted.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not assessed against other proposals or experiment cells because runtime isolation forbids inspecting them; the candidate was derived solely from the supplied archetype and computer-science domain card.","revision_record":{"parent_version":null,"progress_targets_addressed":[],"conceptual_changes":[],"operational_changes":[],"evidence_changes":[],"claim_changes":[]}}