first commit

schema.sql

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+create table if not exists books (
+  book_id text primary key
+);
+
+create table if not exists chapters (
+  id integer primary key autoincrement,
+  book_id text,
+  chapter_id text,
+  text_en text,
+  text_zh text,
+  foreign key (book_id) references books(book_id),
+  unique(book_id, chapter_id)
+);
+
+create table if not exists paragraphs (
+  id integer primary key autoincrement,
+  book_id text not null,
+  chapter_id text not null,
+  text_en text,
+  text_zh text,
+  char_count integer,
+  foreign key (book_id, chapter_id) references chapters(book_id, chapter_id)
+);