MVP

create_session_state_table.sql

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+-- Session State Table for Data Persistence
+-- This table stores critical timing and context variables for crash recovery
+
+CREATE TABLE IF NOT EXISTS session_state (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    session_id VARCHAR(255) UNIQUE NOT NULL,
+    production_start_time BIGINT,
+    operating_time DOUBLE DEFAULT 0,
+    last_update_time BIGINT,
+    tracking_enabled TINYINT(1) DEFAULT 0,
+    cycle_count INT DEFAULT 0,
+    active_work_order_id VARCHAR(255),
+    active_work_order_data JSON,
+    machine_online TINYINT(1) DEFAULT 1,
+    production_started TINYINT(1) DEFAULT 0,
+    last_cycle_time BIGINT,
+    last_machine_state INT DEFAULT 0,
+    created_at BIGINT NOT NULL,
+    updated_at BIGINT NOT NULL,
+    is_active TINYINT(1) DEFAULT 1,
+    INDEX idx_session_id (session_id),
+    INDEX idx_is_active (is_active),
+    INDEX idx_updated_at (updated_at)
+);
+
+-- Create indexes for performance
+CREATE INDEX IF NOT EXISTS idx_active_work_order ON session_state(active_work_order_id);
+CREATE INDEX IF NOT EXISTS idx_session_active ON session_state(session_id, is_active);