Add parts of speech

20230218073436_parts.down.sql

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+BEGIN;
+ALTER TABLE words DROP COLUMN part_id;
+DROP TABLE parts;
+COMMIT;

20230218073436_parts.up.sql

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+BEGIN;
+
+CREATE TABLE parts (
+--  name         type      constraints
+    id           BIGSERIAL PRIMARY KEY,
+    language_id  BIGINT    NOT NULL REFERENCES languages (id),
+    english_name VARCHAR   NOT NULL,
+
+--  CONSTRAINT name                      CHECK (condition)
+    CONSTRAINT english_name_is_sane_text CHECK (is_sane_text(english_name))
+);
+
+CREATE UNIQUE INDEX parts_language_english_name
+    ON parts (language_id, english_name);
+
+ALTER TABLE words ADD COLUMN part_id BIGINT REFERENCES parts (id);
+
+COMMIT;