Add meta table to database

Author: SiboVG

README.md

@@ -53,6 +53,15 @@ The SQLite schema lives in `schema/V1__initial_schema.sql` and is optimized for
 
 ### Tables and Columns
 
+**meta**
+
+| Column | Type | Notes |
+| :--- | :--- | :--- |
+| key | TEXT | Primary key |
+| value | TEXT | Required |
+
+Keys stored include `schema_version`, `database_version`, `generated_at`, and `motor_count`.
+
 **manufacturers**
 
 | Column | Type | Notes |

schema/V1__initial_schema.sql

@@ -1,6 +1,11 @@
 -- Enable foreign keys
 PRAGMA foreign_keys = ON;
 
+CREATE TABLE IF NOT EXISTS meta (
+    key TEXT PRIMARY KEY,
+    value TEXT NOT NULL
+);
+
 CREATE TABLE IF NOT EXISTS manufacturers (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
     name TEXT NOT NULL UNIQUE,
@@ -36,4 +41,4 @@ CREATE TABLE IF NOT EXISTS thrust_data (
 -- Indices for fast lookups in OpenRocket
 CREATE INDEX idx_motor_mfr ON motors(manufacturer_id);
 CREATE INDEX idx_motor_diameter ON motors(diameter);
-CREATE INDEX idx_motor_impulse ON motors(impulse);
+CREATE INDEX idx_motor_impulse ON motors(impulse);

scripts/build_database.py

@@ -196,10 +196,22 @@ def build():
     if motor_count == 0:
         print("Warning: No motors imported. Check your data directory contents.")
 
-    # --- FIX START ---
-    # You must commit the transaction before running VACUUM
+    schema_version = 1
+    database_version = int(datetime.now().strftime("%Y%m%d%H%M%S"))
+    generated_at = datetime.now().isoformat()
+
+    cursor.executemany(
+        "INSERT OR REPLACE INTO meta (key, value) VALUES (?, ?)",
+        [
+            ("schema_version", str(schema_version)),
+            ("database_version", str(database_version)),
+            ("generated_at", generated_at),
+            ("motor_count", str(motor_count)),
+        ],
+    )
+
+    # Commit the transaction before running VACUUM
     conn.commit()
-    # --- FIX END ---
 
     # Optimize
     conn.execute("VACUUM")
@@ -216,9 +228,9 @@ def build():
         sha256.update(f.read())
 
     meta = {
-        "schema_version": 1,
-        "database_version": int(datetime.now().strftime("%Y%m%d%H%M%S")),
-        "generated_at": datetime.now().isoformat(),
+        "schema_version": schema_version,
+        "database_version": database_version,
+        "generated_at": generated_at,
         "motor_count": motor_count,
         "sha256": sha256.hexdigest(),
         "download_url": "https://openrocket.github.io/motor-database/motors.db.gz"

scripts/fetch_updates.py

@@ -20,7 +20,7 @@
 
 
 def load_state():
-    # Fix: Handle empty or corrupt JSON files gracefully
+    # Handle empty or corrupt JSON files gracefully
     if os.path.exists(STATE_FILE):
         try:
             with open(STATE_FILE, 'r') as f: