update

sqlite/create_db.py

@@ -15,7 +15,19 @@ import sqlite3
 conn = sqlite3.connect("/var/www/nebuleair_pro_4g/sqlite/sensors.db")
 cursor = conn.cursor()
 
-# Create a table 1
+# Create a table timer
+cursor.execute("""
+CREATE TABLE IF NOT EXISTS timestamp_table  (
+   id INTEGER PRIMARY KEY CHECK (id = 1),  -- Enforce single row by using fixed ID
+    last_updated DATETIME NOT NULL
+)
+""")
+cursor.execute("""
+    INSERT INTO timestamp_table (id, last_updated) VALUES (1, CURRENT_TIMESTAMP);
+""")
+
+
+# Create a table NPM
 cursor.execute("""
 CREATE TABLE IF NOT EXISTS data_NPM (
     timestamp TEXT,
@@ -27,7 +39,7 @@ CREATE TABLE IF NOT EXISTS data_NPM (
 )
 """)
 
-# Create a table 2
+# Create a table BME280
 cursor.execute("""
 CREATE TABLE IF NOT EXISTS data_BME280 (
     timestamp TEXT,
@@ -37,7 +49,7 @@ CREATE TABLE IF NOT EXISTS data_BME280 (
 )
 """)
 
-# Create a table 3
+# Create a table cairsens
 cursor.execute("""
 CREATE TABLE IF NOT EXISTS data_envea (
     timestamp TEXT,
@@ -49,7 +61,7 @@ CREATE TABLE IF NOT EXISTS data_envea (
 )
 """)
 
-# Create a table 4
+# Create a table NPM_5ch
 cursor.execute("""
 CREATE TABLE IF NOT EXISTS data_NPM_5channels (
     timestamp TEXT,