+caching layer for sorted alms

controllers/almanach.go

@@ -2,6 +2,7 @@ package controllers
 
 import (
 	"sort"
+	"sync"
 
 	"github.com/Theodor-Springmann-Stiftung/musenalm/app"
 	"github.com/Theodor-Springmann-Stiftung/musenalm/dbmodels"
@@ -17,6 +18,52 @@ const (
 	TEMPLATE_ALMANACH = "/almanach/"
 )
 
+// Simple in-memory cache for sorted entries
+var (
+	sortedEntriesCache struct {
+		sync.RWMutex
+		entries []*dbmodels.Entry
+	}
+)
+
+// InvalidateSortedEntriesCache clears the cached sorted entries list
+func InvalidateSortedEntriesCache() {
+	sortedEntriesCache.Lock()
+	defer sortedEntriesCache.Unlock()
+	sortedEntriesCache.entries = nil
+}
+
+// getSortedEntries returns cached sorted entries or loads and caches them
+func getSortedEntries(app core.App) ([]*dbmodels.Entry, error) {
+	// Try to read from cache first
+	sortedEntriesCache.RLock()
+	if sortedEntriesCache.entries != nil {
+		cached := sortedEntriesCache.entries
+		sortedEntriesCache.RUnlock()
+		return cached, nil
+	}
+	sortedEntriesCache.RUnlock()
+
+	// Cache miss - load and sort
+	sortedEntriesCache.Lock()
+	defer sortedEntriesCache.Unlock()
+
+	// Double-check after acquiring write lock
+	if sortedEntriesCache.entries != nil {
+		return sortedEntriesCache.entries, nil
+	}
+
+	entries := []*dbmodels.Entry{}
+	if err := app.RecordQuery(dbmodels.ENTRIES_TABLE).All(&entries); err != nil {
+		return nil, err
+	}
+
+	dbmodels.Sort_Entries_Title_Year(entries)
+	sortedEntriesCache.entries = entries
+
+	return entries, nil
+}
+
 func init() {
 	rp := &AlmanachPage{
 		StaticPage: pagemodels.StaticPage{
@@ -197,14 +244,14 @@ func NewAlmanachResult(app core.App, id string, params BeitraegeFilterParameters
 }
 
 func entryNeighborsByPreferredTitle(app core.App, entryID string) (*dbmodels.Entry, *dbmodels.Entry, error) {
-	entries := []*dbmodels.Entry{}
-	if err := app.RecordQuery(dbmodels.ENTRIES_TABLE).All(&entries); err != nil {
+	entries, err := getSortedEntries(app)
+	if err != nil {
 		return nil, nil, err
 	}
 	if len(entries) == 0 {
 		return nil, nil, nil
 	}
-	dbmodels.Sort_Entries_Title_Year(entries)
+
 	for index, item := range entries {
 		if item.Id != entryID {
 			continue

controllers/almanach_edit.go

@@ -190,6 +190,9 @@ func (p *AlmanachEditPage) POSTSave(engine *templating.Engine, app core.App) Han
 			})
 		}
 
+		// Invalidate sorted entries cache since entry was modified
+		InvalidateSortedEntriesCache()
+
 		// Check if fields that affect contents changed
 		contentsNeedUpdate := entry.PreferredTitle() != oldPreferredTitle ||
 			entry.Year() != oldYear ||
@@ -290,6 +293,9 @@ func (p *AlmanachEditPage) POSTDelete(engine *templating.Engine, app core.App) H
 			})
 		}
 
+		// Invalidate sorted entries cache since entry was deleted
+		InvalidateSortedEntriesCache()
+
 		// Delete from FTS5 index asynchronously
 		go func(appInstance core.App, entryID string) {
 			if err := dbmodels.DeleteFTS5Entry(appInstance, entryID); err != nil {

controllers/almanach_new.go

@@ -146,6 +146,9 @@ func (p *AlmanachNewPage) POSTSave(engine *templating.Engine, app core.App) Hand
 			})
 		}
 
+		// Invalidate sorted entries cache since new entry was created
+		InvalidateSortedEntriesCache()
+
 		// Update FTS5 index asynchronously
 		go func(appInstance core.App, entryID string) {
 			freshEntry, err := dbmodels.Entries_ID(appInstance, entryID)