import re
from datetime import datetime

def format_date(date_str):
    """Format a date string into a human-readable format."""
    try:
        date_obj = datetime.strptime(date_str, "%Y-%m-%d")
        return date_obj.strftime("%b %d, %Y")
    except ValueError:
        return date_str

def extract_hashtags(text):
    """Extract hashtags from a given text."""
    return re.findall(r"#\w+", text)

def calculate_sentiment_score(sentiment_data):
    """Calculate an overall sentiment score from sentiment data."""
    if not sentiment_data:
        return 0
    return sum(sentiment_data.values()) / len(sentiment_data)

def paginate(query, page, per_page=10):
    """Paginate a SQLAlchemy query."""
    return query.paginate(page=page, per_page=per_page, error_out=False)