Initial database setup.

database.py

@@ -0,0 +1,136 @@
+# database.py
+
+import sqlite3
+import time
+
+DB_FILE = "reddit_stocks.db"
+
+def get_db_connection():
+    """Establishes a connection to the SQLite database."""
+    conn = sqlite3.connect(DB_FILE)
+    conn.row_factory = sqlite3.Row
+    return conn
+
+def initialize_db():
+    """Initializes the database and creates tables if they don't exist."""
+    conn = get_db_connection()
+    cursor = conn.cursor()
+
+    # --- Create tickers table ---
+    cursor.execute("""
+        CREATE TABLE IF NOT EXISTS tickers (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            symbol TEXT NOT NULL UNIQUE,
+            market_cap INTEGER,
+            last_updated INTEGER
+        )
+    """)
+
+    # --- Create subreddits table ---
+    cursor.execute("""
+        CREATE TABLE IF NOT EXISTS subreddits (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            name TEXT NOT NULL UNIQUE
+        )
+    """)
+
+    # --- Create mentions table ---
+    cursor.execute("""
+        CREATE TABLE IF NOT EXISTS mentions (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            ticker_id INTEGER,
+            subreddit_id INTEGER,
+            post_id TEXT NOT NULL,
+            mention_timestamp INTEGER NOT NULL,
+            sentiment_score REAL,
+            FOREIGN KEY (ticker_id) REFERENCES tickers (id),
+            FOREIGN KEY (subreddit_id) REFERENCES subreddits (id),
+            UNIQUE(ticker_id, post_id)
+        )
+    """)
+
+    conn.commit()
+    conn.close()
+    print("Database initialized successfully.")
+
+def get_or_create_entity(conn, table_name, column_name, value):
+    """Generic function to get or create an entity and return its ID."""
+    cursor = conn.cursor()
+    cursor.execute(f"SELECT id FROM {table_name} WHERE {column_name} = ?", (value,))
+    result = cursor.fetchone()
+
+    if result:
+        return result['id']
+    else:
+        cursor.execute(f"INSERT INTO {table_name} ({column_name}) VALUES (?)", (value,))
+        conn.commit()
+        return cursor.lastrowid
+
+def add_mention(conn, ticker_id, subreddit_id, post_id, timestamp):
+    """Adds a new mention to the database, ignoring duplicates."""
+    cursor = conn.cursor()
+    try:
+        cursor.execute(
+            "INSERT INTO mentions (ticker_id, subreddit_id, post_id, mention_timestamp) VALUES (?, ?, ?, ?)",
+            (ticker_id, subreddit_id, post_id, timestamp)
+        )
+        conn.commit()
+    except sqlite3.IntegrityError:
+        pass
+
+def update_ticker_market_cap(conn, ticker_id, market_cap):
+    """Updates the market cap and timestamp for a specific ticker."""
+    cursor = conn.cursor()
+    current_timestamp = int(time.time())
+    cursor.execute(
+        "UPDATE tickers SET market_cap = ?, last_updated = ? WHERE id = ?",
+        (market_cap, current_timestamp, ticker_id)
+    )
+    conn.commit()
+
+def get_ticker_info(conn, ticker_id):
+    """Retrieves all info for a specific ticker by its ID."""
+    cursor = conn.cursor()
+    cursor.execute("SELECT * FROM tickers WHERE id = ?", (ticker_id,))
+    return cursor.fetchone()
+
+def generate_summary_report():
+    """Queries the DB to generate and print a summary with market caps."""
+    print("\n--- Summary Report ---")
+    conn = get_db_connection()
+    cursor = conn.cursor()
+
+    query = """
+        SELECT
+            t.symbol,
+            t.market_cap,
+            COUNT(m.id) as mention_count
+        FROM mentions m
+        JOIN tickers t ON m.ticker_id = t.id
+        GROUP BY t.symbol, t.market_cap
+        ORDER BY mention_count DESC
+        LIMIT 20;
+    """
+
+    results = cursor.execute(query).fetchall()
+
+    print(f"{'Ticker':<10} | {'Mentions':<10} | {'Market Cap':<20}")
+    print("-" * 45)
+
+    for row in results:
+        market_cap_str = "N/A"
+        if row['market_cap']:
+            # Format market cap into a readable string (e.g., $1.23T, $45.6B, $123.4M)
+            mc = row['market_cap']
+            if mc >= 1e12:
+                market_cap_str = f"${mc/1e12:.2f}T"
+            elif mc >= 1e9:
+                market_cap_str = f"${mc/1e9:.2f}B"
+            elif mc >= 1e6:
+                market_cap_str = f"${mc/1e6:.2f}M"
+            else:
+                market_cap_str = f"${mc:,}"
+
+        print(f"{row['symbol']:<10} | {row['mention_count']:<10} | {market_cap_str:<20}")
+
+    conn.close()