i18n: add diagnostic logging to localizer + lang-toggle click path

app/routers/api.py

@@ -21,6 +21,10 @@ from app.auth import require_token, maybe_current_user, CurrentUser
 from app.services.i18n import ACTIVE_LANGUAGES
 from app.config import get_settings
 from app.db import get_session, utcnow
+from app.logging import get_logger
+
+
+log = get_logger("api_router")
 from app.templates_env import templates
 from app.models import (
     Headline,
@@ -312,8 +316,14 @@ async def _localized_content(
     Returns None to signal 'use row.content as-is' (the default English
     path)."""
     if row is None or principal is None or principal.user is None:
+        log.info("i18n.log.skip", reason="no_row_or_principal",
+                 row_id=getattr(row, "id", None),
+                 has_principal=principal is not None,
+                 has_user=(principal.user is not None) if principal else False)
         return None
     lang = (principal.user.lang or "en")
+    log.info("i18n.log.lookup", row_id=row.id, lang=lang,
+             user_id=principal.user.id)
     if lang == "en":
         return None
     t = (await session.execute(
@@ -321,6 +331,9 @@ async def _localized_content(
         .where(StrategicLogTranslation.log_id == row.id)
         .where(StrategicLogTranslation.lang == lang)
     )).scalar_one_or_none()
+    log.info("i18n.log.result", row_id=row.id, lang=lang,
+             found=(t is not None),
+             content_preview=(t.content[:60] if t is not None else None))
     return t.content if t is not None else None
 
 
@@ -335,8 +348,14 @@ async def _apply_localized_summary(
     for the lifetime of this GET request.
     """
     if row is None or principal is None or principal.user is None:
+        log.info("i18n.summary.skip", reason="no_row_or_principal",
+                 row_id=getattr(row, "id", None),
+                 has_principal=principal is not None,
+                 has_user=(principal.user is not None) if principal else False)
         return
     lang = (principal.user.lang or "en")
+    log.info("i18n.summary.lookup", row_id=row.id, lang=lang,
+             user_id=principal.user.id)
     if lang == "en":
         return
     t = (await session.execute(
@@ -344,6 +363,9 @@ async def _apply_localized_summary(
         .where(IndicatorSummaryTranslation.summary_id == row.id)
         .where(IndicatorSummaryTranslation.lang == lang)
     )).scalar_one_or_none()
+    log.info("i18n.summary.result", row_id=row.id, lang=lang,
+             found=(t is not None),
+             content_preview=(t.content[:60] if t is not None else None))
     if t is not None:
         row.content = t.content
 

app/templates/base.html

@@ -143,12 +143,11 @@
     };
 
     window.cassandraSetLang = async function (newLang) {
+      console.log('[lang] click', newLang);
       var pill = document.getElementById('lang-toggle');
-      if (!pill) return;
+      if (!pill) { console.warn('[lang] no pill element'); return; }
       var prev = pill.dataset.lang;
-      if (prev === newLang) return;
+      if (prev === newLang) { console.log('[lang] already', newLang); return; }
-      // Optimistic update — flip the pill immediately so the click feels
-      // responsive. Revert on PATCH failure.
       pill.dataset.lang = newLang;
       try {
         var r = await fetch('/api/settings/language', {
@@ -157,18 +156,17 @@
           credentials: 'same-origin',
           body: JSON.stringify({lang: newLang}),
         });
+        console.log('[lang] PATCH', r.status);
         if (!r.ok) throw new Error('HTTP ' + r.status);
-        // Trigger HTMX-driven panels to re-fetch in the new language.
-        // Same shape as cassandraSetTone — every panel that listens to
-        // tone-changed also listens to lang-changed.
         ['#dash-header-container', '#log-panel .panel-body',
          '#indicators-body', '#log-content'].forEach(function (sel) {
           var el = document.querySelector(sel);
+          console.log('[lang] trigger', sel, 'found:', !!el, 'htmx:', !!window.htmx);
           if (el && window.htmx) window.htmx.trigger(el, 'lang-changed');
         });
       } catch (e) {
         pill.dataset.lang = prev;
-        console.warn('language switch failed:', e);
+        console.warn('[lang] switch failed:', e);
       }
     };
   </script>