feat(idb): add IDB content version check system, wire to journals

Adds check_and_clear_idb_tables() helper in core__idb_dexie.ts that clears
Dexie tables when their content version changes. Version numbers live in
IDB_CONTENT_VERSIONS (store_versions.ts); state tracked in localStorage
(ae_idb_ver__{module}__{table}) so each table clears exactly once per bump.

Wired into db_journals.ts (pilot): journal_entry at v3 clears stale
content_md_html/history_md_html data cached before the properties_to_save fix.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/ae_core/core__idb_dexie.ts

@@ -1,6 +1,53 @@
 import type { Dexie, Table } from 'dexie';
 import { browser } from '$app/environment';
 
+/**
+ * Checks IDB table content versions and clears any tables whose version has
+ * changed since the last check.
+ *
+ * Version numbers live in IDB_CONTENT_VERSIONS (store_versions.ts). State is
+ * tracked in localStorage (ae_idb_ver__{module}__{table}) so each table is
+ * cleared exactly once per version bump, not on every page load.
+ *
+ * Call once at module init in each db_*.ts, after the singleton is created.
+ * The clear is intentionally fire-and-forget — the SWR pattern repopulates
+ * from the API naturally after a cache miss.
+ *
+ * A null stored version (never tracked) is treated as outdated so existing
+ * installs with stale cached data are cleaned up on first run.
+ */
+export async function check_and_clear_idb_tables({
+    db_instance,
+    module_name,
+    table_versions,
+    log_lvl = 0
+}: {
+    db_instance: Dexie;
+    module_name: string;
+    table_versions: Record<string, number>;
+    log_lvl?: number;
+}): Promise<void> {
+    if (!browser) return;
+
+    for (const [table_name, expected_version] of Object.entries(table_versions)) {
+        const ls_key = `ae_idb_ver__${module_name}__${table_name}`;
+        const stored_raw = localStorage.getItem(ls_key);
+        const stored_version = stored_raw !== null ? parseInt(stored_raw, 10) : null;
+
+        if (stored_version === expected_version) continue;
+
+        try {
+            await db_instance.table(table_name).clear();
+            localStorage.setItem(ls_key, String(expected_version));
+            console.log(
+                `[IDB] "${module_name}.${table_name}" cleared — v${stored_version ?? 'new'} → v${expected_version}`
+            );
+        } catch (e) {
+            console.warn(`[IDB] Failed to clear "${module_name}.${table_name}":`, e);
+        }
+    }
+}
+
 /**
  * Extracts the primary key from an object using a prioritized list of possible key names.
  * @param obj The object to extract the ID from.

src/lib/ae_journals/db_journals.ts

@@ -1,7 +1,10 @@
 import Dexie, { type Table } from 'dexie';
+import { browser } from '$app/environment';
 
 import type { key_val } from '$lib/stores/ae_stores';
 import type { ae_Journal, ae_JournalEntry } from '$lib/types/ae_types';
+import { IDB_CONTENT_VERSIONS } from '$lib/stores/store_versions';
+import { check_and_clear_idb_tables } from '$lib/ae_core/core__idb_dexie';
 
 // li = list
 // kv = key value list
@@ -141,3 +144,14 @@ export class MySubClassedDexie extends Dexie {
 }
 
 export const db_journals = new MySubClassedDexie();
+
+// On each page load, clear any tables whose content version has changed.
+// Versions are defined in store_versions.ts IDB_CONTENT_VERSIONS.journals.
+// Each table is only cleared once per version bump (tracked in localStorage).
+if (browser) {
+    check_and_clear_idb_tables({
+        db_instance: db_journals,
+        module_name: 'journals',
+        table_versions: IDB_CONTENT_VERSIONS.journals
+    }).catch((e) => console.warn('[db_journals] IDB version check failed:', e));
+}

src/lib/stores/store_versions.ts

@@ -37,6 +37,61 @@ export const AE_PRES_MGMT_LOC_VERSION = 1; // Added 2026-04-02: new standalone P
 export const AE_BADGES_LOC_VERSION = 1;     // Added 2026-04-02: promoted from events_loc.badges
 export const AE_LEADS_LOC_VERSION = 1;      // Added 2026-04-03: promoted from events_loc.leads
 
+/**
+ * IDB_CONTENT_VERSIONS — per-table Dexie content version tracking.
+ *
+ * NOT YET ACTIVE. Wiring task tracked in TODO__Agents.md (post June 10).
+ *
+ * HOW IT WILL WORK (when wired):
+ * Each db_*.ts will call a helper (core__idb_dexie.ts) on open that checks a
+ * lightweight `_meta` table. If the stored version for a table doesn't match
+ * the constant here, the table is cleared and the version record is updated.
+ * The SWR pattern then repopulates from the API on next access.
+ *
+ * HOW TO USE (once active):
+ * Bump a table's version here when properties_to_save changes in a way that
+ * makes existing cached records stale (e.g. adding/removing stored fields,
+ * changing computed field behavior). Do NOT bump for schema-only changes
+ * (new indexes, new tables) — those belong in db.version() Dexie migrations.
+ *
+ * IDAA NOTES:
+ * IDAA tables (posts, archives) are already cleared aggressively via
+ * indexedDB.deleteDatabase() on sign-out and on auth failure in (idaa)/+layout.svelte.
+ * The content version check is a complementary mechanism for deploy-time resets,
+ * NOT a replacement for the auth-driven wipe. When wiring, ensure IDAA tables are
+ * only cleared on IDB open (not mid-session), and that the _meta table itself is
+ * also cleared when deleteDatabase() is called.
+ */
+export const IDB_CONTENT_VERSIONS = {
+    journals: {
+        journal: 3,
+        journal_entry: 3 // 2026-05-14: removed content_md_html + history_md_html from properties_to_save
+    },
+    events: {
+        event: 1,
+        event_session: 1,
+        event_presenter: 1,
+        event_badge: 1,
+        event_device: 1,
+        event_location: 1,
+        event_file: 1
+    },
+    core: {
+        site_domain: 1,
+        person: 1,
+        user: 1
+    },
+    // IDAA modules — see IDAA NOTES above before wiring these
+    posts: {
+        post: 1,
+        post_comment: 1
+    },
+    archives: {
+        archive: 1,
+        archive_content: 1
+    }
+};
+
 // Version check side-effect: runs on import, before any persisted() call.
 // Guard presence of `localStorage` and its functions for safety (SSR, Node flags).
 if (