Add SQLite database optimization with VACUUM

lib/check/health_json.sh

@@ -128,6 +128,7 @@ EOF
     items+=('maintenance_scripts|System Log Rotation|Rotate and compress system logs with newsyslog|true')
     items+=('swap_cleanup|Virtual Memory Refresh|Reset swap files and dynamic pager service|true')
     items+=('network_optimization|Network Stack Optimization|Refresh DNS, rebuild ARP & restart mDNSResponder|true')
+    items+=('sqlite_vacuum|SQLite Database Optimization|Optimize user databases with VACUUM to reduce size|true')
 
     # Output items as JSON
     local first=true

lib/optimize/tasks.sh

@@ -204,6 +204,96 @@ opt_network_optimization() {
     echo -e "  ${GREEN}✓${NC} mDNSResponder optimized"
 }
 
+# SQLite database optimization
+# Runs VACUUM on safe user-level databases to reduce size and improve performance
+# Only operates on databases that are not in use and meet size threshold
+opt_sqlite_vacuum() {
+    local optimized_count=0
+    local total_saved_kb=0
+    local min_size_kb=1024  # Only optimize databases larger than 1MB
+
+    # List of safe databases to optimize
+    # Exclude critical system databases like Mail, Messages, Photos
+    local -a safe_databases=(
+        "$HOME/Library/Safari/History.db"
+        "$HOME/Library/Safari/CloudTabs.db"
+    )
+
+    if [[ -t 1 ]]; then
+        MOLE_SPINNER_PREFIX="  " start_inline_spinner "Scanning databases..."
+    fi
+
+    for db_path in "${safe_databases[@]}"; do
+        # Check if database exists
+        [[ ! -f "$db_path" ]] && continue
+
+        # Check if it's a SQLite database
+        if ! file "$db_path" 2>/dev/null | grep -q "SQLite"; then
+            continue
+        fi
+
+        # Check size threshold
+        local db_size_kb
+        db_size_kb=$(get_path_size_kb "$db_path")
+        [[ $db_size_kb -lt $min_size_kb ]] && continue
+
+        # Check if database is in use
+        if lsof "$db_path" > /dev/null 2>&1; then
+            debug_log "Skipping $db_path - in use"
+            continue
+        fi
+
+        # Check disk space (VACUUM needs ~2x database size as temporary space)
+        local free_space_kb
+        free_space_kb=$(df -k "$(dirname "$db_path")" | tail -1 | awk '{print $4}')
+        if [[ $free_space_kb -lt $((db_size_kb * 2)) ]]; then
+            debug_log "Skipping $db_path - insufficient disk space"
+            continue
+        fi
+
+        # Verify database integrity before VACUUM
+        if ! sqlite3 "$db_path" "PRAGMA integrity_check;" 2>/dev/null | grep -q "ok"; then
+            debug_log "Skipping $db_path - integrity check failed"
+            continue
+        fi
+
+        # Get size before optimization
+        local size_before=$db_size_kb
+
+        # Perform VACUUM with error handling
+        if sqlite3 "$db_path" "VACUUM;" 2>/dev/null; then
+            # Verify database integrity after VACUUM
+            if ! sqlite3 "$db_path" "PRAGMA integrity_check;" 2>/dev/null | grep -q "ok"; then
+                debug_log "Warning: $db_path integrity check failed after VACUUM"
+                continue
+            fi
+
+            # Get size after optimization
+            local size_after
+            size_after=$(get_path_size_kb "$db_path")
+            local saved_kb=$((size_before - size_after))
+
+            if [[ $saved_kb -gt 0 ]]; then
+                ((optimized_count++))
+                ((total_saved_kb += saved_kb))
+            fi
+        else
+            debug_log "Failed to VACUUM $db_path"
+        fi
+    done
+
+    if [[ -t 1 ]]; then
+        stop_inline_spinner
+    fi
+
+    if [[ $optimized_count -gt 0 ]]; then
+        local saved_human=$(bytes_to_human "$((total_saved_kb * 1024))")
+        echo -e "  ${GREEN}✓${NC} Optimized $optimized_count databases ($saved_human saved)"
+    else
+        echo -e "  ${GREEN}✓${NC} Databases already optimized"
+    fi
+}
+
 # Clean Spotlight user caches
 
 # Execute optimization by action name
@@ -222,6 +312,7 @@ execute_optimization() {
         local_snapshots) opt_local_snapshots ;;
         fix_broken_configs) opt_fix_broken_configs ;;
         network_optimization) opt_network_optimization ;;
+        sqlite_vacuum) opt_sqlite_vacuum ;;
         *)
             echo -e "${YELLOW}${ICON_ERROR}${NC} Unknown action: $action"
             return 1