pleme-migrations 0.1.1

//! Zero-downtime migration strategies

/// Zero-downtime migration strategy
pub struct ZeroDowntimeStrategy;

impl ZeroDowntimeStrategy {
    /// Create new strategy
    pub fn new() -> Self {
        Self
    }

    /// Validate migration is safe for zero-downtime
    pub fn validate(&self, _sql: &str) -> bool {
        // Placeholder - would check for:
        // - No DROP COLUMN
        // - No ALTER COLUMN TYPE (without using USING)
        // - No ADD COLUMN NOT NULL (without DEFAULT)
        true
    }
}

impl Default for ZeroDowntimeStrategy {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_zero_downtime_strategy() {
        let strategy = ZeroDowntimeStrategy::new();
        assert!(strategy.validate("ALTER TABLE users ADD COLUMN email TEXT"));
    }
}