megaration pali_sent_index

db/sqlite/pali_sent_index/down.sql

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+DROP INDEX  IF EXISTS  pali_sent_index_book ;
+DROP TABLE pali_sent_index ;

db/sqlite/pali_sent_index/up.sql

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+
+-- 表：pali_sent_index
+CREATE TABLE pali_sent_index (
+	id SERIAL PRIMARY KEY,
+    book   INTEGER,
+    para   INTEGER,
+    strlen INTEGER,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX pali_sent_index_book ON pali_sent_index (book, para);