CREATE TABLE contacts (
    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    organization_id BIGINT UNSIGNED NULL,
    first_name VARCHAR(150) NOT NULL,
    last_name VARCHAR(150) NOT NULL,
    email VARCHAR(255) NULL,
    phone VARCHAR(50) NULL,
    title VARCHAR(150) NULL,
    linkedin_url VARCHAR(2048) NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    deleted_at TIMESTAMP NULL,
    FOREIGN KEY (organization_id) REFERENCES organizations(id) ON DELETE SET NULL,
    INDEX idx_contacts_email (email)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE crm_activities (
    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    organization_id BIGINT UNSIGNED NOT NULL,
    contact_id BIGINT UNSIGNED NULL,
    type VARCHAR(50) NOT NULL, -- 'meeting', 'email', 'note', 'follow_up'
    details TEXT NOT NULL,
    scheduled_at TIMESTAMP NULL,
    completed_at TIMESTAMP NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    deleted_at TIMESTAMP NULL,
    FOREIGN KEY (organization_id) REFERENCES organizations(id) ON DELETE CASCADE,
    FOREIGN KEY (contact_id) REFERENCES contacts(id) ON DELETE SET NULL,
    INDEX idx_crm_act_type (type),
    INDEX idx_crm_act_org (organization_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;