diff --git a/apps/api/src/audit-policy.ts b/apps/api/src/audit-policy.ts
new file mode 100644
index 0000000..3a64c74
--- /dev/null
+++ b/apps/api/src/audit-policy.ts
@@ -0,0 +1,224 @@
+import type BetterSqlite3 from "better-sqlite3";
+
+export const auditRetentionMilliseconds = 180 * 24 * 60 * 60 * 1_000;
+
+const auditRefPattern = /^[A-Za-z0-9][A-Za-z0-9_.:-]{0,159}$/;
+const forbiddenSummaryKeys = new Set([
+  "absolute_path", "api_key", "body", "code_hmac", "content", "credential",
+  "email", "image", "image_content", "password", "path", "prompt", "secret",
+  "session_token", "verification_code", "whitelist",
+]);
+const forbiddenSummaryKeyFragments = [
+  "content", "credential", "email", "image", "password", "path", "prompt", "secret", "token",
+];
+const safeStringPattern = /^[A-Za-z0-9_.:@-]{1,160}$/;
+
+function isSafeSummaryValue(value: unknown, depth: number): boolean {
+  if (depth > 3) return false;
+  if (value === null || typeof value === "boolean") return true;
+  if (typeof value === "number") return Number.isSafeInteger(value);
+  if (typeof value === "string") return safeStringPattern.test(value) && !value.includes("@");
+  if (Array.isArray(value)) return value.length <= 20 && value.every((entry) => isSafeSummaryValue(entry, depth + 1));
+  if (!value || typeof value !== "object") return false;
+  const entries = Object.entries(value);
+  return entries.length <= 32 && entries.every(([key, entry]) => (
+    auditRefPattern.test(key)
+    && !forbiddenSummaryKeys.has(key.toLowerCase())
+    && !forbiddenSummaryKeyFragments.some((fragment) => key.toLowerCase().includes(fragment))
+    && isSafeSummaryValue(entry, depth + 1)
+  ));
+}
+
+export function isSafeAuditRef(value: unknown) {
+  return typeof value === "string" && auditRefPattern.test(value) ? 1 : 0;
+}
+
+export function isSafeAuditSummaryJson(value: unknown) {
+  if (typeof value !== "string" || Buffer.byteLength(value, "utf8") > 2_048) return 0;
+  try {
+    return isSafeSummaryValue(JSON.parse(value), 0) ? 1 : 0;
+  } catch {
+    return 0;
+  }
+}
+
+export function serializeAuditSummary(value: Record<string, unknown> | null) {
+  if (value === null) return null;
+  const serialized = JSON.stringify(value);
+  if (isSafeAuditSummaryJson(serialized) !== 1) throw new Error("audit_summary_sensitive_or_invalid");
+  return serialized;
+}
+
+function toMilliseconds(value: string | number | null | undefined, fallback: number) {
+  if (typeof value === "number" && Number.isSafeInteger(value)) return value;
+  const parsed = Date.parse(String(value));
+  return Number.isFinite(parsed) ? parsed : fallback;
+}
+
+function createAdminOperationTable(database: BetterSqlite3.Database) {
+  database.exec(`
+    CREATE TABLE admin_operation_logs (
+      log_id TEXT PRIMARY KEY,
+      actor_type TEXT NOT NULL CHECK (actor_type IN ('system', 'super_admin')),
+      actor_ref TEXT NOT NULL CHECK (dada_audit_ref_is_safe(actor_ref) = 1),
+      operation_type TEXT NOT NULL CHECK (dada_audit_ref_is_safe(operation_type) = 1),
+      target_type TEXT NOT NULL CHECK (dada_audit_ref_is_safe(target_type) = 1),
+      target_ref TEXT NOT NULL CHECK (dada_audit_ref_is_safe(target_ref) = 1),
+      result TEXT NOT NULL CHECK (result IN ('succeeded', 'failed')),
+      before_summary TEXT CHECK (before_summary IS NULL OR dada_audit_summary_is_safe(before_summary) = 1),
+      after_summary TEXT CHECK (after_summary IS NULL OR dada_audit_summary_is_safe(after_summary) = 1),
+      occurred_at INTEGER NOT NULL,
+      expires_at INTEGER NOT NULL CHECK (expires_at = occurred_at + ${auditRetentionMilliseconds})
+    );
+  `);
+}
+
+function installAdminOperationTriggers(database: BetterSqlite3.Database) {
+  database.exec(`
+    DROP TRIGGER IF EXISTS admin_operation_logs_no_update;
+    DROP TRIGGER IF EXISTS admin_operation_logs_no_delete;
+    CREATE TRIGGER admin_operation_logs_no_update
+      BEFORE UPDATE ON admin_operation_logs
+      BEGIN SELECT RAISE(ABORT, 'admin_operation_logs_immutable'); END;
+    CREATE TRIGGER admin_operation_logs_no_delete
+      BEFORE DELETE ON admin_operation_logs
+      WHEN dada_allow_retention_purge() <> 1 OR OLD.expires_at > dada_retention_purge_now()
+      BEGIN SELECT RAISE(ABORT, 'admin_operation_logs_immutable'); END;
+  `);
+}
+
+export function ensureAdminOperationAuditSchema(database: BetterSqlite3.Database, fallbackNow: number) {
+  const table = database.prepare(`
+    SELECT sql FROM sqlite_master WHERE type = 'table' AND name = 'admin_operation_logs'
+  `).get() as { sql: string } | undefined;
+  if (!table) {
+    createAdminOperationTable(database);
+    installAdminOperationTriggers(database);
+    return;
+  }
+  if (table.sql.includes("dada_audit_summary_is_safe") && table.sql.includes(String(auditRetentionMilliseconds))) {
+    installAdminOperationTriggers(database);
+    return;
+  }
+
+  const columns = database.prepare("PRAGMA table_info(admin_operation_logs)").all() as Array<{ name: string }>;
+  const current = columns.some((column) => column.name === "actor_type");
+  const rows = current
+    ? database.prepare("SELECT * FROM admin_operation_logs").all() as Array<Record<string, string | number | null>>
+    : database.prepare("SELECT log_id, operation, outcome, target_ref, created_at FROM admin_operation_logs").all() as Array<Record<string, string | number | null>>;
+  const migrate = database.transaction(() => {
+    database.exec(`
+      DROP TRIGGER IF EXISTS admin_operation_logs_no_update;
+      DROP TRIGGER IF EXISTS admin_operation_logs_no_delete;
+      ALTER TABLE admin_operation_logs RENAME TO admin_operation_logs_before_wp1_06;
+    `);
+    createAdminOperationTable(database);
+    const insert = database.prepare(`
+      INSERT INTO admin_operation_logs (
+        log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
+        result, before_summary, after_summary, occurred_at, expires_at
+      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+    `);
+    for (const row of rows) {
+      const occurredAt = toMilliseconds(current ? row.occurred_at! : row.created_at!, fallbackNow);
+      const expiresAt = current ? toMilliseconds(row.expires_at!, fallbackNow) : occurredAt + auditRetentionMilliseconds;
+      if (expiresAt !== occurredAt + auditRetentionMilliseconds) throw new Error("audit_retention_invalid");
+      const beforeSummary = current && typeof row.before_summary === "string"
+        ? serializeAuditSummary(JSON.parse(row.before_summary) as Record<string, unknown>)
+        : null;
+      const afterSummary = current
+        ? typeof row.after_summary === "string" ? serializeAuditSummary(JSON.parse(row.after_summary) as Record<string, unknown>) : null
+        : serializeAuditSummary({ legacy_outcome: String(row.outcome) });
+      insert.run(
+        row.log_id,
+        current ? row.actor_type : "system",
+        current ? row.actor_ref : "managed_storage_migration",
+        current ? row.operation_type : row.operation,
+        current ? row.target_type : "legacy_operation",
+        row.target_ref,
+        current ? row.result : String(row.outcome).startsWith("denied") ? "failed" : "succeeded",
+        beforeSummary,
+        afterSummary,
+        occurredAt,
+        expiresAt,
+      );
+    }
+    database.exec("DROP TABLE admin_operation_logs_before_wp1_06");
+    installAdminOperationTriggers(database);
+  });
+  migrate();
+}
+
+function createPrivateAccessTable(database: BetterSqlite3.Database) {
+  database.exec(`
+    CREATE TABLE private_content_access_logs (
+      log_id TEXT PRIMARY KEY,
+      actor_ref TEXT NOT NULL CHECK (length(actor_ref) = 36 AND dada_audit_ref_is_safe(actor_ref) = 1),
+      subject_ref TEXT NOT NULL CHECK (length(subject_ref) = 36 AND dada_audit_ref_is_safe(subject_ref) = 1),
+      target_ref TEXT NOT NULL CHECK (length(target_ref) = 36 AND dada_audit_ref_is_safe(target_ref) = 1),
+      content_type TEXT NOT NULL CHECK (content_type IN ('image', 'prompt')),
+      occurred_at INTEGER NOT NULL,
+      expires_at INTEGER NOT NULL CHECK (expires_at = occurred_at + ${auditRetentionMilliseconds})
+    );
+  `);
+}
+
+function installPrivateAccessTriggers(database: BetterSqlite3.Database) {
+  database.exec(`
+    DROP TRIGGER IF EXISTS private_content_access_logs_no_update;
+    DROP TRIGGER IF EXISTS private_content_access_logs_no_delete;
+    CREATE TRIGGER private_content_access_logs_no_update
+      BEFORE UPDATE ON private_content_access_logs
+      WHEN dada_allow_privacy_purge() <> 1
+        OR OLD.subject_ref <> dada_privacy_purge_subject()
+        OR NEW.actor_ref <> OLD.actor_ref
+        OR NEW.content_type <> OLD.content_type
+        OR NEW.occurred_at <> OLD.occurred_at
+        OR NEW.expires_at <> OLD.expires_at
+        OR NEW.subject_ref = OLD.subject_ref
+        OR NEW.target_ref = OLD.target_ref
+      BEGIN SELECT RAISE(ABORT, 'private_content_access_logs_immutable'); END;
+    CREATE TRIGGER private_content_access_logs_no_delete
+      BEFORE DELETE ON private_content_access_logs
+      WHEN dada_allow_retention_purge() <> 1 OR OLD.expires_at > dada_retention_purge_now()
+      BEGIN SELECT RAISE(ABORT, 'private_content_access_logs_immutable'); END;
+  `);
+}
+
+export function ensurePrivateAccessAuditSchema(database: BetterSqlite3.Database) {
+  const table = database.prepare(`
+    SELECT sql FROM sqlite_master WHERE type = 'table' AND name = 'private_content_access_logs'
+  `).get() as { sql: string } | undefined;
+  if (!table) {
+    createPrivateAccessTable(database);
+    installPrivateAccessTriggers(database);
+    return;
+  }
+  if (table.sql.includes(String(auditRetentionMilliseconds))) {
+    installPrivateAccessTriggers(database);
+    return;
+  }
+  const rows = database.prepare("SELECT * FROM private_content_access_logs").all() as Array<Record<string, string | number>>;
+  const migrate = database.transaction(() => {
+    database.exec(`
+      DROP TRIGGER IF EXISTS private_content_access_logs_no_update;
+      DROP TRIGGER IF EXISTS private_content_access_logs_no_delete;
+      ALTER TABLE private_content_access_logs RENAME TO private_content_access_logs_before_wp1_06;
+    `);
+    createPrivateAccessTable(database);
+    const insert = database.prepare(`
+      INSERT INTO private_content_access_logs (
+        log_id, actor_ref, subject_ref, target_ref, content_type, occurred_at, expires_at
+      ) VALUES (?, ?, ?, ?, ?, ?, ?)
+    `);
+    for (const row of rows) {
+      const occurredAt = toMilliseconds(row.occurred_at, 0);
+      const expiresAt = toMilliseconds(row.expires_at, 0);
+      if (expiresAt !== occurredAt + auditRetentionMilliseconds) throw new Error("audit_retention_invalid");
+      insert.run(row.log_id, row.actor_ref, row.subject_ref, row.target_ref, row.content_type, occurredAt, expiresAt);
+    }
+    database.exec("DROP TABLE private_content_access_logs_before_wp1_06");
+    installPrivateAccessTriggers(database);
+  });
+  migrate();
+}
diff --git a/apps/api/src/managed-storage.ts b/apps/api/src/managed-storage.ts
index a74ebd3..916746e 100644
--- a/apps/api/src/managed-storage.ts
+++ b/apps/api/src/managed-storage.ts
@@ -15,6 +15,13 @@ import { pipeline } from "node:stream/promises";
 
 import type BetterSqlite3 from "better-sqlite3";
 
+import {
+  auditRetentionMilliseconds,
+  ensureAdminOperationAuditSchema,
+  isSafeAuditRef,
+  isSafeAuditSummaryJson,
+  serializeAuditSummary,
+} from "./audit-policy.js";
 import { resolvePathWithinRoot } from "./local-data-root.js";
 import {
   HARD_LIMIT_BYTES,
@@ -93,8 +100,8 @@ function now() {
   return new Date().toISOString();
 }
 
-function auditExpiry(occurredAt: string) {
-  return new Date(Date.parse(occurredAt) + 180 * 24 * 60 * 60 * 1_000).toISOString();
+function auditExpiry(occurredAt: number) {
+  return occurredAt + auditRetentionMilliseconds;
 }
 
 function validatePositiveBytes(value: number, name: string) {
@@ -155,6 +162,12 @@ export class ManagedStorage {
     this.database.pragma("journal_mode = WAL");
     this.database.pragma("foreign_keys = ON");
     this.database.pragma("busy_timeout = 5000");
+    this.database.function("dada_audit_ref_is_safe", { deterministic: true }, isSafeAuditRef);
+    this.database.function("dada_audit_summary_is_safe", { deterministic: true }, isSafeAuditSummaryJson);
+    this.database.function("dada_allow_privacy_purge", { deterministic: false }, () => 0);
+    this.database.function("dada_privacy_purge_subject", { deterministic: false }, () => "");
+    this.database.function("dada_allow_retention_purge", { deterministic: false }, () => 0);
+    this.database.function("dada_retention_purge_now", { deterministic: false }, () => 0);
     this.migrate();
     const state = this.database.prepare("SELECT managed_content_bytes FROM local_backend_storage_state WHERE singleton = 1").get() as { managed_content_bytes: number };
     this.measurementBaselineBytes = Math.max(0, state.managed_content_bytes - this.physicalManagedBytes());
@@ -247,7 +260,7 @@ export class ManagedStorage {
     if (!managedFileColumns.some((column) => column.name === "owner_ref")) {
       this.database.exec("ALTER TABLE managed_files ADD COLUMN owner_ref TEXT");
     }
-    this.migrateLegacyAdminOperationLogs();
+    ensureAdminOperationAuditSchema(this.database, Date.now());
     const initial = classifyCapacity(0, 0);
     this.database.prepare(`
       INSERT OR IGNORE INTO local_backend_storage_state
@@ -256,54 +269,6 @@ export class ManagedStorage {
     `).run(HARD_LIMIT_BYTES, initial.capacity_notice_level, initial.storage_status, now());
   }
 
-  private migrateLegacyAdminOperationLogs() {
-    const columns = this.database.prepare("PRAGMA table_info(admin_operation_logs)").all() as Array<{ name: string }>;
-    if (columns.some((column) => column.name === "actor_type")) return;
-    const entries = this.database.prepare(`
-      SELECT log_id, operation, outcome, target_ref, created_at FROM admin_operation_logs
-    `).all() as Array<{ created_at: string; log_id: string; operation: string; outcome: string; target_ref: string }>;
-    this.database.exec(`
-      ALTER TABLE admin_operation_logs RENAME TO admin_operation_logs_legacy;
-      CREATE TABLE admin_operation_logs (
-        log_id TEXT PRIMARY KEY,
-        actor_type TEXT NOT NULL CHECK (actor_type IN ('system', 'super_admin')),
-        actor_ref TEXT NOT NULL,
-        operation_type TEXT NOT NULL,
-        target_type TEXT NOT NULL,
-        target_ref TEXT NOT NULL,
-        result TEXT NOT NULL CHECK (result IN ('succeeded', 'failed')),
-        before_summary TEXT,
-        after_summary TEXT,
-        occurred_at TEXT NOT NULL,
-        expires_at TEXT NOT NULL
-      );
-    `);
-    const insert = this.database.prepare(`
-      INSERT INTO admin_operation_logs (
-        log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
-        result, before_summary, after_summary, occurred_at, expires_at
-      ) VALUES (?, 'system', 'managed_storage_migration', ?, 'legacy_operation', ?, ?, NULL, ?, ?, ?)
-    `);
-    for (const entry of entries) {
-      insert.run(
-        entry.log_id,
-        entry.operation,
-        entry.target_ref,
-        entry.outcome.startsWith("denied") ? "failed" : "succeeded",
-        JSON.stringify({ legacy_outcome: entry.outcome }),
-        entry.created_at,
-        auditExpiry(entry.created_at),
-      );
-    }
-    this.database.exec(`
-      DROP TABLE admin_operation_logs_legacy;
-      CREATE TRIGGER IF NOT EXISTS admin_operation_logs_no_update
-        BEFORE UPDATE ON admin_operation_logs BEGIN SELECT RAISE(ABORT, 'admin_operation_logs_immutable'); END;
-      CREATE TRIGGER IF NOT EXISTS admin_operation_logs_no_delete
-        BEFORE DELETE ON admin_operation_logs BEGIN SELECT RAISE(ABORT, 'admin_operation_logs_immutable'); END;
-    `);
-  }
-
   close() {
     this.database.close();
   }
@@ -629,14 +594,15 @@ export class ManagedStorage {
         return row.count > 0;
       });
       if (conflict) {
-        const occurredAt = now();
-        this.database.prepare("UPDATE asset_cleanup_requests SET status = 'denied', confirmed_at = ? WHERE request_id = ?").run(occurredAt, requestId);
+        const confirmedAt = now();
+        const occurredAt = Date.now();
+        this.database.prepare("UPDATE asset_cleanup_requests SET status = 'denied', confirmed_at = ? WHERE request_id = ?").run(confirmedAt, requestId);
         this.database.prepare(`
           INSERT INTO admin_operation_logs (
             log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
             result, before_summary, after_summary, occurred_at, expires_at
           ) VALUES (?, 'system', 'managed_storage', 'asset_cleanup', 'cleanup_request', ?, 'failed', NULL, ?, ?, ?)
-        `).run(randomUUID(), requestId, JSON.stringify({ reason: "reference_conflict" }), occurredAt, auditExpiry(occurredAt));
+        `).run(randomUUID(), requestId, serializeAuditSummary({ reason: "reference_conflict" }), occurredAt, auditExpiry(occurredAt));
         return false;
       }
       for (const file of files) {
@@ -647,14 +613,15 @@ export class ManagedStorage {
           VALUES (?, ?, ?, ?, 1, 'purge', 'pending', ?)
         `).run(randomUUID(), file.file_id, file.relative_path, file.byte_size, now());
       }
-      const occurredAt = now();
-      this.database.prepare("UPDATE asset_cleanup_requests SET status = 'queued', confirmed_at = ? WHERE request_id = ?").run(occurredAt, requestId);
+      const confirmedAt = now();
+      const occurredAt = Date.now();
+      this.database.prepare("UPDATE asset_cleanup_requests SET status = 'queued', confirmed_at = ? WHERE request_id = ?").run(confirmedAt, requestId);
       this.database.prepare(`
         INSERT INTO admin_operation_logs (
           log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
           result, before_summary, after_summary, occurred_at, expires_at
         ) VALUES (?, 'system', 'managed_storage', 'asset_cleanup', 'cleanup_request', ?, 'succeeded', NULL, ?, ?, ?)
-      `).run(randomUUID(), requestId, JSON.stringify({ status: "queued" }), occurredAt, auditExpiry(occurredAt));
+      `).run(randomUUID(), requestId, serializeAuditSummary({ status: "queued" }), occurredAt, auditExpiry(occurredAt));
       return true;
     });
     if (!transaction()) throw new Error("ASSET_HISTORY_REFERENCE_CONFLICT");
@@ -683,13 +650,13 @@ export class ManagedStorage {
             }
           }
           this.database.prepare("UPDATE file_cleanup_queue SET status = 'completed', completed_at = ?, last_error = NULL WHERE cleanup_id = ?").run(now(), row.cleanup_id);
-          const occurredAt = now();
+          const occurredAt = Date.now();
           this.database.prepare(`
             INSERT INTO admin_operation_logs (
               log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
               result, before_summary, after_summary, occurred_at, expires_at
             ) VALUES (?, 'system', 'managed_storage', 'physical_file_cleanup', 'cleanup_queue_item', ?, 'succeeded', NULL, ?, ?, ?)
-          `).run(randomUUID(), row.cleanup_id, JSON.stringify({ status: "completed" }), occurredAt, auditExpiry(occurredAt));
+          `).run(randomUUID(), row.cleanup_id, serializeAuditSummary({ status: "completed" }), occurredAt, auditExpiry(occurredAt));
           this.recordPhysicalMeasurement();
         });
         finish();
diff --git a/apps/api/src/registration.ts b/apps/api/src/registration.ts
index 9a3e7b7..2b33d23 100644
--- a/apps/api/src/registration.ts
+++ b/apps/api/src/registration.ts
@@ -3,6 +3,13 @@ import { createRequire } from "node:module";
 
 import type BetterSqlite3 from "better-sqlite3";
 
+import {
+  ensureAdminOperationAuditSchema,
+  ensurePrivateAccessAuditSchema,
+  isSafeAuditRef,
+  isSafeAuditSummaryJson,
+  serializeAuditSummary,
+} from "./audit-policy.js";
 import type { ResendAdapter } from "./resend-adapter.js";
 import {
   RegistrationError,
@@ -222,6 +229,7 @@ export class RegistrationService {
   readonly options: Required<Pick<RegistrationServiceOptions, "clock" | "codeGenerator" | "inviteCodeGenerator">> & RegistrationServiceOptions;
   private adminAllowlistHashes = new Set<string>();
   private privacyPurgeActive = false;
+  private privacyPurgeSubject = "";
 
   constructor(options: RegistrationServiceOptions) {
     assertSecret("invitePepper", options.invitePepper);
@@ -239,8 +247,12 @@ export class RegistrationService {
     this.database.pragma("foreign_keys = ON");
     this.database.pragma("synchronous = FULL");
     this.database.pragma("busy_timeout = 5000");
+    this.database.function("dada_audit_ref_is_safe", { deterministic: true }, isSafeAuditRef);
+    this.database.function("dada_audit_summary_is_safe", { deterministic: true }, isSafeAuditSummaryJson);
     this.database.function("dada_allow_privacy_purge", { deterministic: false }, () => this.privacyPurgeActive ? 1 : 0);
+    this.database.function("dada_privacy_purge_subject", { deterministic: false }, () => this.privacyPurgeSubject);
     this.database.function("dada_allow_retention_purge", { deterministic: false }, () => 0);
+    this.database.function("dada_retention_purge_now", { deterministic: false }, () => 0);
     this.migrate();
   }
 
@@ -1167,6 +1179,7 @@ export class RegistrationService {
       }
 
       this.privacyPurgeActive = true;
+      this.privacyPurgeSubject = session.user_id;
       try {
         this.database.prepare("DELETE FROM credit_ledger WHERE user_id = ?").run(session.user_id);
         this.database.prepare(`
@@ -1174,6 +1187,7 @@ export class RegistrationService {
         `).run(randomUUID(), randomUUID(), session.user_id);
       } finally {
         this.privacyPurgeActive = false;
+        this.privacyPurgeSubject = "";
       }
 
       this.queueOwnedManagedFiles(session.user_id, now);
@@ -1468,59 +1482,8 @@ export class RegistrationService {
         singleton, applied_revision, allowlist_count, applied_at
       ) VALUES (1, 0, 0, 0);
     `);
-    this.migrateLegacyAdminOperationLogs();
-  }
-
-  private migrateLegacyAdminOperationLogs() {
-    const columns = this.database.prepare("PRAGMA table_info(admin_operation_logs)").all() as Array<{ name: string }>;
-    if (columns.some((column) => column.name === "actor_type")) return;
-    const legacy = this.database.prepare(`
-      SELECT log_id, operation, outcome, target_ref, created_at FROM admin_operation_logs
-    `).all() as Array<{ created_at: string | number; log_id: string; operation: string; outcome: string; target_ref: string }>;
-    this.database.exec(`
-      DROP TRIGGER IF EXISTS admin_operation_logs_no_update;
-      DROP TRIGGER IF EXISTS admin_operation_logs_no_delete;
-      ALTER TABLE admin_operation_logs RENAME TO admin_operation_logs_legacy;
-      CREATE TABLE admin_operation_logs (
-        log_id TEXT PRIMARY KEY,
-        actor_type TEXT NOT NULL CHECK (actor_type IN ('system', 'super_admin')),
-        actor_ref TEXT NOT NULL,
-        operation_type TEXT NOT NULL,
-        target_type TEXT NOT NULL,
-        target_ref TEXT NOT NULL,
-        result TEXT NOT NULL CHECK (result IN ('succeeded', 'failed')),
-        before_summary TEXT,
-        after_summary TEXT,
-        occurred_at INTEGER NOT NULL,
-        expires_at INTEGER NOT NULL
-      );
-    `);
-    const insert = this.database.prepare(`
-      INSERT INTO admin_operation_logs (
-        log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
-        result, before_summary, after_summary, occurred_at, expires_at
-      ) VALUES (?, 'system', 'managed_storage_migration', ?, 'legacy_operation', ?, ?, NULL, ?, ?, ?)
-    `);
-    for (const entry of legacy) {
-      const parsed = typeof entry.created_at === "number" ? entry.created_at : Date.parse(entry.created_at);
-      const occurredAt = Number.isFinite(parsed) ? parsed : this.options.clock();
-      insert.run(
-        entry.log_id,
-        entry.operation,
-        entry.target_ref,
-        entry.outcome.startsWith("denied") ? "failed" : "succeeded",
-        JSON.stringify({ legacy_outcome: entry.outcome }),
-        occurredAt,
-        occurredAt + 180 * 24 * 60 * 60 * 1_000,
-      );
-    }
-    this.database.exec(`
-      DROP TABLE admin_operation_logs_legacy;
-      CREATE TRIGGER admin_operation_logs_no_update
-        BEFORE UPDATE ON admin_operation_logs BEGIN SELECT RAISE(ABORT, 'admin_operation_logs_immutable'); END;
-      CREATE TRIGGER admin_operation_logs_no_delete
-        BEFORE DELETE ON admin_operation_logs BEGIN SELECT RAISE(ABORT, 'admin_operation_logs_immutable'); END;
-    `);
+    ensureAdminOperationAuditSchema(this.database, this.options.clock());
+    ensurePrivateAccessAuditSchema(this.database);
   }
 
   private runImmediate<T>(
@@ -1757,8 +1720,8 @@ export class RegistrationService {
       input.targetType,
       input.targetRef,
       input.result,
-      input.beforeSummary === null ? null : JSON.stringify(input.beforeSummary),
-      input.afterSummary === null ? null : JSON.stringify(input.afterSummary),
+      serializeAuditSummary(input.beforeSummary),
+      serializeAuditSummary(input.afterSummary),
       now,
       now + 180 * 24 * 60 * 60 * 1_000,
     );
diff --git a/apps/worker/src/retention-cleanup.ts b/apps/worker/src/retention-cleanup.ts
index 795d50c..ab54e45 100644
--- a/apps/worker/src/retention-cleanup.ts
+++ b/apps/worker/src/retention-cleanup.ts
@@ -9,6 +9,7 @@ export class RetentionCleanup {
   private readonly clock: () => number;
   private readonly database: BetterSqlite3.Database;
   private retentionPurgeActive = false;
+  private retentionPurgeNow = 0;
 
   constructor(input: { clock?: () => number; databasePath: string }) {
     this.clock = input.clock ?? Date.now;
@@ -18,6 +19,7 @@ export class RetentionCleanup {
     this.database.pragma("busy_timeout = 5000");
     this.database.function("dada_allow_privacy_purge", { deterministic: false }, () => 0);
     this.database.function("dada_allow_retention_purge", { deterministic: false }, () => this.retentionPurgeActive ? 1 : 0);
+    this.database.function("dada_retention_purge_now", { deterministic: false }, () => this.retentionPurgeNow);
   }
 
   purgeExpired() {
@@ -25,16 +27,21 @@ export class RetentionCleanup {
     this.database.exec("BEGIN IMMEDIATE");
     try {
       this.retentionPurgeActive = true;
+      this.retentionPurgeNow = now;
+      const adminOperations = this.database.prepare("DELETE FROM admin_operation_logs WHERE expires_at <= ?").run(now);
       const privateAccess = this.database.prepare("DELETE FROM private_content_access_logs WHERE expires_at <= ?").run(now);
       const anonymous = this.database.prepare("DELETE FROM anonymous_retained_events WHERE expires_at <= ?").run(now);
       this.retentionPurgeActive = false;
+      this.retentionPurgeNow = 0;
       this.database.exec("COMMIT");
       return {
+        admin_operation_logs: adminOperations.changes,
         anonymous_events: anonymous.changes,
         private_access_logs: privateAccess.changes,
       };
     } catch (error) {
       this.retentionPurgeActive = false;
+      this.retentionPurgeNow = 0;
       if (this.database.inTransaction) this.database.exec("ROLLBACK");
       throw error;
     }
diff --git a/package.json b/package.json
index 7452ae4..51be68d 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,9 @@
     "test:wp1-04": "node scripts/run-wp1-04-validation.mjs",
     "test:wp1-04:red": "node scripts/run-wp1-04-validation.mjs --phase red",
     "test:wp1-05": "node scripts/run-wp1-05-validation.mjs",
-    "test:wp1-05:red": "node scripts/run-wp1-05-validation.mjs --phase red"
+    "test:wp1-05:red": "node scripts/run-wp1-05-validation.mjs --phase red",
+    "test:wp1-06": "node scripts/run-wp1-06-validation.mjs",
+    "test:wp1-06:red": "node scripts/run-wp1-06-validation.mjs --phase red"
   },
   "devDependencies": {
     "@playwright/test": "1.62.0",
diff --git a/scripts/run-wp1-06-validation.mjs b/scripts/run-wp1-06-validation.mjs
new file mode 100644
index 0000000..08f7dea
--- /dev/null
+++ b/scripts/run-wp1-06-validation.mjs
@@ -0,0 +1,61 @@
+import { createHash } from "node:crypto";
+import { spawnSync } from "node:child_process";
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const phaseIndex = process.argv.indexOf("--phase");
+const phase = phaseIndex >= 0 ? process.argv[phaseIndex + 1] : "green";
+if (!["red", "green"].includes(phase)) throw new Error(`Unsupported phase: ${phase}`);
+const runId = process.env.DADA_TDD_RUN_ID ?? `wp1-06-${phase}-${new Date().toISOString().replace(/[^0-9]/g, "")}`;
+const testId = "TDD-WP1-AUD-001-immutable-triggers";
+const runDirectory = resolve("artifacts", "tdd", runId);
+const caseDirectory = resolve(runDirectory, "cases", testId);
+if (existsSync(runDirectory)) throw new Error(`Evidence run already exists: ${runId}`);
+mkdirSync(caseDirectory, { recursive: true });
+
+const commandsToRun = phase === "red"
+  ? [["audit-integration", ["exec", "vitest", "run", "tests/integration/wp1-06-audit-immutability.test.ts"]]]
+  : [["integration", ["test:integration"]], ["tdd-trace", ["validate:tdd-trace"]]];
+const commandResults = [];
+for (const [name, args] of commandsToRun) {
+  const command = `pnpm ${args.join(" ")}`;
+  const started_at = new Date().toISOString();
+  const execution = spawnSync(process.env.ComSpec ?? "cmd.exe", ["/d", "/s", "/c", command], {
+    encoding: "utf8",
+    env: { ...process.env, DADA_EVIDENCE_DIR_AUDIT: caseDirectory },
+  });
+  if (execution.stdout) process.stdout.write(execution.stdout);
+  if (execution.stderr) process.stderr.write(execution.stderr);
+  commandResults.push({ command, exit_code: execution.status ?? 1, finished_at: new Date().toISOString(), name, started_at });
+}
+writeFileSync(resolve(caseDirectory, "commands.json"), `${JSON.stringify({ commands: commandResults, phase, run_id: runId }, null, 2)}\n`);
+const expectedEvidence = phase === "red"
+  ? ["red-observation.json"]
+  : ["sql-results.json", "db-diff.json", "trigger-definition.json"];
+const commandState = phase === "red"
+  ? commandResults.every((result) => result.exit_code !== 0)
+  : commandResults.every((result) => result.exit_code === 0);
+if (phase === "red") {
+  writeFileSync(resolve(caseDirectory, "red-observation.json"), `${JSON.stringify({
+    expected_failure: "audit retention capability, exact expiry and summary constraints are incomplete",
+    status: commandState ? "red_confirmed" : "failed",
+  }, null, 2)}\n`);
+}
+const evidence_refs = expectedEvidence;
+const missing_evidence = evidence_refs.filter((file) => !existsSync(resolve(caseDirectory, file)));
+const targetStatus = phase === "red" ? "red_confirmed" : "passed";
+const status = commandState && missing_evidence.length === 0 ? targetStatus : "failed";
+const result = {
+  acceptance_criteria: ["AC-50"], automation: ["automated"],
+  commit: spawnSync("git", ["rev-parse", "--short", "HEAD"], { encoding: "utf8" }).stdout.trim(),
+  evidence_refs, layer: ["DB"],
+  manifest: { path: "tasks.manifest.json", sha256: createHash("sha256").update(readFileSync("tasks.manifest.json")).digest("hex").toUpperCase() },
+  missing_evidence, phase, requirements: ["ADMIN-05", "ADMIN-09"], run_id: runId, status,
+  task_id: "TASK-WP1-06", test_id: testId, work_package: "WP-1",
+  worktree_under_test: spawnSync("git", ["status", "--porcelain"], { encoding: "utf8" }).stdout.trim() ? "uncommitted implementation" : "clean committed implementation",
+};
+writeFileSync(resolve(caseDirectory, "result.json"), `${JSON.stringify(result, null, 2)}\n`);
+const summary = { cases: [{ missing_evidence, status, test_id: testId }], phase, run_id: runId, status };
+writeFileSync(resolve(runDirectory, "evidence.json"), `${JSON.stringify(summary, null, 2)}\n`);
+console.log(JSON.stringify(summary, null, 2));
+if (status !== targetStatus) process.exit(1);
diff --git a/tests/integration/wp1-05-account-deletion.test.ts b/tests/integration/wp1-05-account-deletion.test.ts
index c298770..460779a 100644
--- a/tests/integration/wp1-05-account-deletion.test.ts
+++ b/tests/integration/wp1-05-account-deletion.test.ts
@@ -152,12 +152,14 @@ describe("TDD-WP1-DEL-002-anonymous-retention", () => {
     const harness = await createRegisteredHarness("retention@example.invalid");
     const userId = harness.completed.user.userId;
     const csrfToken = harness.service.issueUserCsrfToken(harness.completed.sessionToken);
-    const accessExpiresAt = fixedNow + 30_000;
+    const accessActorRef = randomUUID();
+    const accessTargetRef = randomUUID();
+    const accessExpiresAt = fixedNow + 180 * 86_400_000;
     harness.service.database.prepare(`
       INSERT INTO private_content_access_logs (
         log_id, actor_ref, subject_ref, target_ref, content_type, occurred_at, expires_at
       ) VALUES (?, ?, ?, ?, 'image', ?, ?)
-    `).run(randomUUID(), "admin-fixture", userId, "private-target-fixture", fixedNow - 1_000, accessExpiresAt);
+    `).run(randomUUID(), accessActorRef, userId, accessTargetRef, fixedNow, accessExpiresAt);
 
     const sent = await harness.service.sendAccountDeletionCode({ csrfToken, sessionToken: harness.completed.sessionToken });
     harness.service.completeAccountDeletion({
@@ -182,12 +184,12 @@ describe("TDD-WP1-DEL-002-anonymous-retention", () => {
     });
     expect(JSON.stringify(anonymous)).not.toContain(harness.email);
     expect(JSON.stringify(anonymous)).not.toContain(userId);
-    expect(JSON.stringify(anonymous)).not.toContain("private-target-fixture");
+    expect(JSON.stringify(anonymous)).not.toContain(accessTargetRef);
 
     const access = harness.service.database.prepare("SELECT * FROM private_content_access_logs").get();
-    expect(access).toMatchObject({ actor_ref: "admin-fixture", expires_at: accessExpiresAt });
+    expect(access).toMatchObject({ actor_ref: accessActorRef, expires_at: accessExpiresAt });
     expect(access.subject_ref).not.toBe(userId);
-    expect(access.target_ref).not.toBe("private-target-fixture");
+    expect(access.target_ref).not.toBe(accessTargetRef);
     expect(access.subject_ref).not.toBe(anonymous[0].anonymous_subject_id);
 
     writeEvidence("DADA_EVIDENCE_DIR_RETENTION", "db-diff.json", {
diff --git a/tests/integration/wp1-06-audit-immutability.test.ts b/tests/integration/wp1-06-audit-immutability.test.ts
new file mode 100644
index 0000000..87049a2
--- /dev/null
+++ b/tests/integration/wp1-06-audit-immutability.test.ts
@@ -0,0 +1,136 @@
+import { randomUUID } from "node:crypto";
+import { createRequire } from "node:module";
+import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join, resolve } from "node:path";
+
+import { afterEach, describe, expect, it } from "vitest";
+
+import { RegistrationService } from "../../apps/api/src/registration.js";
+import { MockResendAdapter } from "../../apps/api/src/resend-adapter.js";
+import { RetentionCleanup } from "../../apps/worker/src/retention-cleanup.js";
+import { registrationNotice } from "../../packages/shared-contracts/src/registration-notice.js";
+
+const requireFromApi = createRequire(new URL("../../apps/api/package.json", import.meta.url));
+const Database = requireFromApi("better-sqlite3");
+const retentionMilliseconds = 180 * 24 * 60 * 60 * 1_000;
+const baseNow = Date.now();
+const roots: string[] = [];
+const services: RegistrationService[] = [];
+
+function createHarness() {
+  const root = mkdtempSync(join(tmpdir(), "dada-wp1-06-audit-"));
+  roots.push(root);
+  const databasePath = join(root, "dada.sqlite3");
+  const service = new RegistrationService({
+    challengePepper: Buffer.alloc(32, 0x41), clock: () => baseNow,
+    currentPrivacyNoticeVersion: registrationNotice.version, databasePath,
+    invitePepper: Buffer.alloc(32, 0x42), resend: new MockResendAdapter(),
+    sessionPepper: Buffer.alloc(32, 0x43),
+  });
+  services.push(service);
+  return { databasePath, service };
+}
+
+function insertAuditPair(service: RegistrationService, occurredAt: number) {
+  const adminLogId = randomUUID();
+  const privateLogId = randomUUID();
+  const expiresAt = occurredAt + retentionMilliseconds;
+  service.database.prepare(`
+    INSERT INTO admin_operation_logs (
+      log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
+      result, before_summary, after_summary, occurred_at, expires_at
+    ) VALUES (?, 'system', 'backend_secure_config', 'secure_config_apply',
+      'secure_config_revision', 'revision:fixture', 'succeeded', ?, ?, ?, ?)
+  `).run(adminLogId, JSON.stringify({ revision: 1 }), JSON.stringify({ revision: 2 }), occurredAt, expiresAt);
+  service.database.prepare(`
+    INSERT INTO private_content_access_logs (
+      log_id, actor_ref, subject_ref, target_ref, content_type, occurred_at, expires_at
+    ) VALUES (?, ?, ?, ?, 'image', ?, ?)
+  `).run(privateLogId, randomUUID(), randomUUID(), randomUUID(), occurredAt, expiresAt);
+  return { adminLogId, expiresAt, privateLogId };
+}
+
+function writeEvidence(file: string, value: unknown) {
+  const directory = process.env.DADA_EVIDENCE_DIR_AUDIT;
+  if (!directory) return;
+  mkdirSync(directory, { recursive: true });
+  writeFileSync(resolve(directory, file), `${JSON.stringify(value, null, 2)}\n`);
+}
+
+afterEach(() => {
+  for (const service of services.splice(0)) service.close();
+  for (const root of roots.splice(0)) rmSync(root, { force: true, recursive: true });
+});
+
+describe("TDD-WP1-AUD-001-immutable-triggers", () => {
+  it("blocks ordinary and forged-scope mutations but lets the Worker delete both audit classes at expiry", () => {
+    const { databasePath, service } = createHarness();
+    const pair = insertAuditPair(service, baseNow);
+    const ordinary = new Database(databasePath);
+    ordinary.pragma("busy_timeout = 5000");
+    try {
+      expect(() => ordinary.prepare("UPDATE admin_operation_logs SET result = 'failed' WHERE log_id = ?").run(pair.adminLogId)).toThrow();
+      expect(() => ordinary.prepare("DELETE FROM admin_operation_logs WHERE log_id = ?").run(pair.adminLogId)).toThrow();
+      expect(() => ordinary.prepare("UPDATE private_content_access_logs SET actor_ref = ? WHERE log_id = ?").run(randomUUID(), pair.privateLogId)).toThrow();
+      expect(() => ordinary.prepare("DELETE FROM private_content_access_logs WHERE log_id = ?").run(pair.privateLogId)).toThrow();
+
+      ordinary.function("dada_allow_retention_purge", () => 1);
+      expect(() => ordinary.prepare("DELETE FROM private_content_access_logs WHERE log_id = ?").run(pair.privateLogId)).toThrow();
+      ordinary.function("dada_allow_privacy_purge", () => 1);
+      expect(() => ordinary.prepare(`
+        UPDATE private_content_access_logs SET subject_ref = ?, target_ref = ? WHERE log_id = ?
+      `).run(randomUUID(), randomUUID(), pair.privateLogId)).toThrow();
+    } finally {
+      ordinary.close();
+    }
+
+    const early = new RetentionCleanup({ clock: () => pair.expiresAt - 1, databasePath });
+    expect(early.purgeExpired()).toEqual({ admin_operation_logs: 0, anonymous_events: 0, private_access_logs: 0 });
+    early.close();
+    const expired = new RetentionCleanup({ clock: () => pair.expiresAt, databasePath });
+    expect(expired.purgeExpired()).toEqual({ admin_operation_logs: 1, anonymous_events: 0, private_access_logs: 1 });
+    expired.close();
+
+    expect(service.database.prepare("SELECT COUNT(*) AS count FROM admin_operation_logs").get().count).toBe(0);
+    expect(service.database.prepare("SELECT COUNT(*) AS count FROM private_content_access_logs").get().count).toBe(0);
+    writeEvidence("sql-results.json", {
+      forged_scope_delete: "blocked",
+      forged_privacy_scope_update: "blocked",
+      ordinary_delete: "blocked",
+      ordinary_update: "blocked",
+      retention_delete_at_expiry: "allowed",
+    });
+    writeEvidence("db-diff.json", { admin_operation_logs: 0, private_content_access_logs: 0 });
+  });
+
+  it("enforces exact retention and rejects sensitive operation summaries", () => {
+    const { service } = createHarness();
+    const badExpiry = baseNow + retentionMilliseconds + 1;
+    expect(() => service.database.prepare(`
+      INSERT INTO private_content_access_logs (
+        log_id, actor_ref, subject_ref, target_ref, content_type, occurred_at, expires_at
+      ) VALUES (?, ?, ?, ?, 'prompt', ?, ?)
+    `).run(randomUUID(), randomUUID(), randomUUID(), randomUUID(), baseNow, badExpiry)).toThrow();
+    expect(() => service.database.prepare(`
+      INSERT INTO admin_operation_logs (
+        log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
+        result, before_summary, after_summary, occurred_at, expires_at
+      ) VALUES (?, 'system', 'backend_secure_config', 'secure_config_apply',
+        'secure_config_revision', 'revision:fixture', 'failed', ?, NULL, ?, ?)
+    `).run(
+      randomUUID(),
+      JSON.stringify({ relative_path: "private/fixture", session_token: "sensitive-fixture-token" }),
+      baseNow,
+      baseNow + retentionMilliseconds,
+    )).toThrow();
+    expect(service.database.prepare("SELECT COUNT(*) AS count FROM admin_operation_logs").get().count).toBe(0);
+    expect(service.database.prepare("SELECT COUNT(*) AS count FROM private_content_access_logs").get().count).toBe(0);
+
+    const triggers = service.database.prepare(`
+      SELECT name, sql FROM sqlite_master
+      WHERE type = 'trigger' AND name LIKE '%logs_%' ORDER BY name
+    `).all();
+    writeEvidence("trigger-definition.json", { triggers });
+  });
+});
diff --git a/tests/worker/wp1-05-retention-cleanup.test.ts b/tests/worker/wp1-05-retention-cleanup.test.ts
index 48cf0f9..6a2ec7a 100644
--- a/tests/worker/wp1-05-retention-cleanup.test.ts
+++ b/tests/worker/wp1-05-retention-cleanup.test.ts
@@ -41,8 +41,8 @@ describe("TDD-WP1-DEL-002 retention worker", () => {
     const anonymousExpiry = baseNow + 2_000;
     service.database.prepare(`
       INSERT INTO private_content_access_logs (log_id, actor_ref, subject_ref, target_ref, content_type, occurred_at, expires_at)
-      VALUES (?, 'admin-fixture', ?, ?, 'prompt', ?, ?)
-    `).run(randomUUID(), randomUUID(), randomUUID(), baseNow - 10_000, accessExpiry);
+      VALUES (?, ?, ?, ?, 'prompt', ?, ?)
+    `).run(randomUUID(), randomUUID(), randomUUID(), randomUUID(), accessExpiry - 180 * 86_400_000, accessExpiry);
     service.database.prepare(`
       INSERT INTO anonymous_retained_events (
         event_id, anonymous_subject_id, event_type, model_id, outcome, error_category,
@@ -54,13 +54,13 @@ describe("TDD-WP1-DEL-002 retention worker", () => {
     expect(() => service.database.prepare("DELETE FROM private_content_access_logs").run()).toThrow();
 
     const early = new RetentionCleanup({ clock: () => baseNow, databasePath });
-    expect(early.purgeExpired()).toEqual({ anonymous_events: 0, private_access_logs: 0 });
+    expect(early.purgeExpired()).toEqual({ admin_operation_logs: 0, anonymous_events: 0, private_access_logs: 0 });
     early.close();
     const firstExpiry = new RetentionCleanup({ clock: () => accessExpiry, databasePath });
-    expect(firstExpiry.purgeExpired()).toEqual({ anonymous_events: 0, private_access_logs: 1 });
+    expect(firstExpiry.purgeExpired()).toEqual({ admin_operation_logs: 0, anonymous_events: 0, private_access_logs: 1 });
     firstExpiry.close();
     const secondExpiry = new RetentionCleanup({ clock: () => anonymousExpiry, databasePath });
-    expect(secondExpiry.purgeExpired()).toEqual({ anonymous_events: 1, private_access_logs: 0 });
+    expect(secondExpiry.purgeExpired()).toEqual({ admin_operation_logs: 0, anonymous_events: 1, private_access_logs: 0 });
     secondExpiry.close();
 
     writeEvidence({