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Update locking

DROP TABLE IF EXISTS url_domains;
CREATE TABLE url_domains
       (url_domain VARCHAR(255) NOT NULL,
       PRIMARY KEY(url_domain))
       ENGINE=InnoDB DEFAULT CHARSET=utf8;       

DROP TABLE IF EXISTS crawl_queue;
CREATE TABLE crawl_queue
       (url VARCHAR(255) NOT NULL,
       parent_url VARCHAR(255),
       url_domain VARCHAR(255) NOT NULL,
       scheme VARCHAR(40) NOT NULL DEFAULT "http",
       analyzed TINYINT NOT NULL DEFAULT 0,
       create_ts TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
       PRIMARY KEY(url))
       ENGINE=InnoDB DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS blacklist;
CREATE TABLE blacklist
       (url_domain VARCHAR(255) NOT NULL,
       PRIMARY KEY(url_domain))
       ENGINE=InnoDB DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS keywords;
CREATE TABLE keywords
       (id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
       word VARCHAR(255) NOT NULL,
       url VARCHAR(255) NOT NULL,
       url_domain VARCHAR(255) NOT NULL,
       word_count SMALLINT UNSIGNED NOT NULL,
       PRIMARY KEY(id))
       ENGINE=InnoDB DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS url_fulltext;
CREATE TABLE url_fulltext
       (url VARCHAR(255) NOT NULL,
       body MEDIUMTEXT NOT NULL,
       page_title TEXT,
       PRIMARY KEY(url))
       ENGINE=InnoDB DEFAULT CHARSET=utf8;
       
CREATE INDEX idx_keyword_search_word ON keywords(word);
CREATE INDEX idx_keyword_search_url ON keywords(url);
CREATE INDEX idx_keyword_search_domain ON keywords(url_domain);