Initial commit, 90% there

.claude/file-history/19ed0c79-1296-4f71-b1d1-78f2ea67aa8b/09c6c90f1c30d27b@v2

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+// ============================================================================
+// STARTUP RECOVERY Function - Session State Restoration (Issue 1)
+// Purpose: Restore session state from database on Node-RED startup/crash recovery
+// Trigger: Inject node on startup
+// Outputs: 2 (UI notification, database query)
+// ============================================================================
+
+// This function should be called on Node-RED startup (via inject node with "inject once after X seconds")
+// It queries the session_state table and restores global variables
+
+const mode = msg.mode || "check";
+
+switch (mode) {
+    // ========================================================================
+    // STEP 1: Query database for session state
+    // ========================================================================
+    case "check": {
+        msg._mode = "query-session-state";
+        msg.topic = "SELECT * FROM session_state WHERE session_key = 'current_session';";
+
+        node.warn("[RECOVERY] Checking for existing session state...");
+
+        return [null, msg];
+    }
+
+    // ========================================================================
+    // STEP 2: Process query results and prompt user
+    // ========================================================================
+    case "process-results": {
+        const results = msg.payload;
+
+        if (!results || results.length === 0) {
+            node.warn("[RECOVERY] No session state found in database");
+            return [null, null];
+        }
+
+        const session = results[0];
+
+        // Check if there's a valid session to restore
+        if (!session.work_order_id || session.cycle_count === 0) {
+            node.warn("[RECOVERY] Session state exists but is empty - nothing to restore");
+            return [null, null];
+        }
+
+        // Check if tracking was enabled
+        if (!session.tracking_enabled) {
+            node.warn("[RECOVERY] Previous session was not actively tracking - restoring state without prompt");
+
+            // Restore the state silently
+            global.set("cycleCount", session.cycle_count || 0);
+            global.set("productionStartTime", session.production_start_time);
+            global.set("operatingTime", Number(session.operating_time) || 0);
+            global.set("downtime", Number(session.downtime) || 0);
+            global.set("lastUpdateTime", session.last_update_time || Date.now());
+            global.set("trackingEnabled", false);
+            global.set("scrapPromptIssuedFor", session.scrap_prompt_issued_for || null);
+            global.set("currentSessionId", session.current_session_id || null);
+
+            return [null, null];
+        }
+
+        // Session was actively tracking - prompt user
+        node.warn(`[RECOVERY] Found active session - Work Order: ${session.work_order_id}, Cycles: ${session.cycle_count}`);
+
+        const promptMsg = {
+            _mode: "recovery-prompt",
+            recoveryPrompt: {
+                workOrderId: session.work_order_id,
+                cycleCount: session.cycle_count,
+                operatingTime: Number(session.operating_time) || 0,
+                downtime: Number(session.downtime) || 0,
+                timestamp: session.last_update_time,
+                sessionData: session
+            }
+        };
+
+        return [promptMsg, null];
+    }
+
+    // ========================================================================
+    // STEP 3: User chose to restore session
+    // ========================================================================
+    case "restore": {
+        const sessionData = msg.payload;
+
+        if (!sessionData) {
+            node.error("[RECOVERY] No session data provided for restore");
+            return [null, null];
+        }
+
+        node.warn(`[RECOVERY] Restoring session - Work Order: ${sessionData.work_order_id}, Cycles: ${sessionData.cycle_count}`);
+
+        // Restore all global variables
+        global.set("cycleCount", sessionData.cycle_count || 0);
+        global.set("productionStartTime", sessionData.production_start_time);
+        global.set("operatingTime", Number(sessionData.operating_time) || 0);
+        global.set("downtime", Number(sessionData.downtime) || 0);
+        global.set("lastUpdateTime", sessionData.last_update_time || Date.now());
+        global.set("trackingEnabled", !!sessionData.tracking_enabled);
+        global.set("scrapPromptIssuedFor", sessionData.scrap_prompt_issued_for || null);
+        global.set("currentSessionId", sessionData.current_session_id || null);
+
+        // Also need to restore activeWorkOrder from work_orders table
+        const queryMsg = {
+            _mode: "query-work-order",
+            topic: `SELECT * FROM work_orders WHERE work_order_id = '${sessionData.work_order_id}';`
+        };
+
+        const notificationMsg = {
+            _mode: "recovery-success",
+            notification: {
+                message: `Session restored: ${sessionData.work_order_id} - ${sessionData.cycle_count} cycles`,
+                type: "success"
+            }
+        };
+
+        return [notificationMsg, queryMsg];
+    }
+
+    // ========================================================================
+    // STEP 4: Set activeWorkOrder from query result
+    // ========================================================================
+    case "set-work-order": {
+        const results = msg.payload;
+
+        if (!results || results.length === 0) {
+            node.error("[RECOVERY] Work order not found in database");
+            return [null, null];
+        }
+
+        const workOrder = results[0];
+
+        // Reconstruct activeWorkOrder object
+        const activeOrder = {
+            id: workOrder.work_order_id,
+            sku: workOrder.sku,
+            target: workOrder.target,
+            good: workOrder.good_parts,
+            scrap: workOrder.scrap_count || 0,
+            cycleTime: workOrder.cycle_time,
+            theoreticalCycleTime: workOrder.cycle_time,
+            progressPercent: workOrder.progress_percent,
+            status: workOrder.status,
+            lastUpdateIso: new Date().toISOString()
+        };
+
+        global.set("activeWorkOrder", activeOrder);
+
+        node.warn(`[RECOVERY] Active work order restored: ${activeOrder.id}`);
+
+        return [null, null];
+    }
+
+    // ========================================================================
+    // STEP 5: User chose to start fresh
+    // ========================================================================
+    case "start-fresh": {
+        node.warn("[RECOVERY] User chose to start fresh - clearing session state");
+
+        // Clear all global variables
+        global.set("cycleCount", 0);
+        global.set("productionStartTime", null);
+        global.set("operatingTime", 0);
+        global.set("downtime", 0);
+        global.set("lastUpdateTime", Date.now());
+        global.set("trackingEnabled", false);
+        global.set("activeWorkOrder", null);
+        global.set("scrapPromptIssuedFor", null);
+        global.set("currentSessionId", null);
+
+        // Clear session_state in database
+        const clearMsg = {
+            _mode: "clear-session-state",
+            topic: `
+                UPDATE session_state
+                SET
+                    work_order_id = NULL,
+                    cycle_count = 0,
+                    production_start_time = NULL,
+                    operating_time = 0,
+                    downtime = 0,
+                    last_update_time = NULL,
+                    tracking_enabled = 0,
+                    machine_state = 0,
+                    scrap_prompt_issued_for = NULL,
+                    current_session_id = NULL
+                WHERE session_key = 'current_session';
+            `
+        };
+
+        const notificationMsg = {
+            _mode: "recovery-cleared",
+            notification: {
+                message: "Started with fresh session",
+                type: "info"
+            }
+        };
+
+        return [notificationMsg, clearMsg];
+    }
+}
+
+// Default
+return [null, null];