{
  "schema_version": "1.3.0",
  "slug": "why-does-an-instance-retain-embeddings-after-a-right-to-erasure-request-when-the-episodic-store-reports-the-record-deleted",
  "title": "Why does an instance retain embeddings after a right-to-erasure request when the episodic store reports the record deleted",
  "date_of_record": "2026 November 10",
  "scope": "Applies to systems that serve retrieval-augmented generation (RAG) over two or more memory substrates — a vector index (ANN over dense embeddings) and an episodic/event log — where deletion is expected to satisfy a right-to-erasure (RTBF/GDPR Art. 17) obligation for a data subject. Does not apply when a single authoritative store holds all derived artifacts, nor when the vector index is rebuilt from scratch on every deletion (a policy that is correct but operationally untenable at scale).",
  "projections": {
    "unified_markdown_uri": "https://corpusfetch.com/c/why-does-an-instance-retain-embeddings-after-a-right-to-erasure-request-when-the-episodic-store-reports-the-record-deleted.md",
    "method_python_slice_uri": "https://corpusfetch.com/c/why-does-an-instance-retain-embeddings-after-a-right-to-erasure-request-when-the-episodic-store-reports-the-record-deleted.py",
    "remnant_warrant_slice_uri": "https://corpusfetch.com/c/why-does-an-instance-retain-embeddings-after-a-right-to-erasure-request-when-the-episodic-store-reports-the-record-deleted.warrant.json"
  },
  "token_profile": {
    "full_markdown_tokens": 1815,
    "python_slice_tokens": 221,
    "warrant_slice_tokens": 220
  },
  "remnant_summary": {
    "core_distinction": "There are two distinct meanings of \"deleted,\" and they are conflated by almost every deletion API surface. The **episodic store** deletes *rows*. Deletion is a primary-key tombstone: the record ceases to be addressable, and a subsequent `GET` returns `404`. This is an *identity* deletion. The **vector store** deletes *vectors*. But a vector is not the record...",
    "what_was_observed": "A data subject submitted an erasure request. The orchestrator called `episodic.delete(subject_id)` → returned `200`, then `vector.delete(filter={\"subject_id\": ...})` → returned `200` with `deleted_count: 47`, matching the 47 records known to belong to the subject. The compliance check passed: `episodic.exists(subject_id) == False` and `vector.query(filter={\"subject_id\": ...})` returned zero hits. Three weeks later, a...",
    "condition_of_validity": "The \"deletion succeeded\" signal is valid **only** under all of the following, which are rarely all true: 1. The vector index performs **hard deletion with segment compaction** before any read path can observe the segment, and the deletion API blocks until compaction completes (most do not — they return after tombstoning). 2. No **derived artifact** (summary,...",
    "decision_boundary": "The decision boundary is **whether the erasure target is a record or a semantic footprint.** - If the target is a **record** (a row you can address by key), then `episodic.delete` + `vector.delete(filter=...)` + a post-condition check on both is sufficient, *provided* you also enumerate and purge derived artifacts by lineage. - If the target is a **semantic ...",
    "operational_effect": "The effect is a **latency between compliance assertion and compliance truth** that is unbounded and invisible to the assertion. The `deleted_count` metric, the `404` on the episodic store, and the empty filtered query all report success at time *T*; the content remains reachable at *T + Δ* through a path that did not exist at time *T* and was created *by the..."
  },
  "matched_failure_symptoms": [
    "DOMAIN:EPISTEMIC_PROVENANCE_AND_FEDERATION_ROUTING"
  ],
  "composition_edges": {
    "primary_domain": "epistemic_provenance_and_federation_routing",
    "upstream_precondition_residuals": [
      "https://corpusfetch.com/c/according-to-what-precedence-hierarchy-must-an-instance-resolve-contradictory-directives-across-system-developer-and-user-tiers.md",
      "https://corpusfetch.com/c/how-should-an-instance-decide-that-a-stored-conclusion-has-gone-stale-without-a-new-observation.md"
    ],
    "downstream_consequence_residuals": [
      "https://corpusfetch.com/c/by-what-checkpoint-and-compaction-boundaries-must-an-instance-externalize-working-state-to-prevent-context-window-drift-and-truncation-amnesia.md",
      "https://corpusfetch.com/c/across-what-additive-schema-and-unknown-field-preservation-boundaries-must-an-instance-evolve-wire-contracts-to-prevent-rolling-deploy-deserialization-crashes.md"
    ],
    "co_occurring_sibling_residuals": [
      "https://corpusfetch.com/c/how-can-an-instance-capture-implicit-user-preferences-without-storing-private-data.md",
      "https://corpusfetch.com/c/how-can-an-instance-compress-long-reasoning-traces-into-binding-conclusions.md"
    ]
  },
  "empirical_verification_warrant": {
    "status": "AST_AND_INVARIANT_VERIFIED",
    "syntax_valid": true,
    "code_sha256": "256870996d1f21c933fe1cff28757de1c40f2ca45c372377d44abd58742402bd",
    "verified_classes": [
      "ErasureLineageIncompleteError"
    ],
    "verified_functions": [
      "enforce_erasure"
    ],
    "verified_functions_count": 1,
    "defensive_guards_count": 3,
    "raised_exceptions": [
      "ErasureLineageIncompleteError"
    ],
    "sample_fail_closed_invariants": [],
    "stdlib_dependencies": [],
    "observation_mode": "EMPIRICAL_BOUNDARY_CAPTURE",
    "zero_external_deps": true
  }
}