feat: Implement caching for enriched station data loading and update map tooltip variable.

fun/map_helpers.R

@@ -30,6 +30,6 @@ highlight_selected_station <- function(proxy, lng, lat, label_html, move_map = T
             circle_stroke_color = "red",
             circle_stroke_width = 3,
             circle_opacity = 0.4,
-            tooltip = label_html
+            tooltip = "popup_content"
         )
 }

global.R

@@ -307,6 +307,26 @@ get_dwd_stations <- function(resolution = "hourly") {
 #' @param resolution "hourly", "daily", or "monthly"
 #' @return Data frame of enriched stations
 load_enriched_stations <- function(resolution = "daily") {
+    # Check for Enriched Cache
+    suffix <- if (resolution == "daily") "_daily" else if (resolution == "monthly") "_monthly" else ""
+    cache_file <- paste0("www/tabs/dwd_stations_enriched", suffix, ".rds")
+
+    if (file.exists(cache_file)) {
+        info <- file.info(cache_file)
+        if (difftime(Sys.time(), info$mtime, units = "days") <= cache_ttl_days) {
+            # Verify it's a valid data frame
+            tryCatch(
+                {
+                    res <- readRDS(cache_file)
+                    if (is.data.frame(res) && nrow(res) > 0) {
+                        return(res)
+                    }
+                },
+                error = function(e) message("Enriched cache corrupted, rebuilding...")
+            )
+        }
+    }
+
     # 1. Get base station list (name, lat, lon, state, etc.)
     st_df <- get_dwd_stations(resolution)
     if (is.null(st_df) || nrow(st_df) == 0) {
@@ -482,13 +502,11 @@ load_enriched_stations <- function(resolution = "daily") {
             available_params = ifelse(is.na(available_params) | available_params == "", "Unknown", available_params)
         )
 
-    as.data.frame(st_df)
+    res <- as.data.frame(st_df)
+    saveRDS(res, cache_file)
+    res
 }
 
-# --- Initial Load (Daily Default) ---
-# Load enriched stations from pre-generated cache
-stations <- load_enriched_stations("daily")
-
 # --- App Defaults ---
 # Default to last year of available data (usually today)
 max_year_data <- year(Sys.Date())