mirror of
https://github.com/rgrgogu/new_starr.git
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80 lines
4.4 KiB
PL/PgSQL
80 lines
4.4 KiB
PL/PgSQL
-- ═══════════════════════════════════════════════════════════════════════════
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-- JUNCTION REVAMP — Units and Lessons run independently (Jul. 7, 2026)
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--
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-- courses ⇄ course_units ⇄ units ⇄ unit_lessons ⇄ lessons
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--
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-- Run order matters: create → backfill → relax progress FKs → drop old columns.
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-- Postgres / CockroachDB compatible. Take a backup before running.
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-- ═══════════════════════════════════════════════════════════════════════════
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BEGIN;
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-- ── 1. Junction tables ───────────────────────────────────────────────────────
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CREATE TABLE course_units (
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course_unit_id BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
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course_id BIGINT NOT NULL REFERENCES courses (course_id) ON DELETE CASCADE,
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unit_id BIGINT NOT NULL REFERENCES units (unit_id) ON DELETE CASCADE,
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order_index INTEGER NOT NULL DEFAULT 0,
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"createdBy" BIGINT NULL,
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"updatedBy" BIGINT NULL,
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"createdAt" TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
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"updatedAt" TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
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CONSTRAINT uq_course_units_course_unit UNIQUE (course_id, unit_id)
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);
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CREATE INDEX idx_course_units_course_id ON course_units (course_id);
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CREATE INDEX idx_course_units_unit_id ON course_units (unit_id);
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CREATE INDEX idx_course_units_order ON course_units (order_index);
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CREATE TABLE unit_lessons (
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unit_lesson_id BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
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unit_id BIGINT NOT NULL REFERENCES units (unit_id) ON DELETE CASCADE,
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lesson_id BIGINT NOT NULL REFERENCES lessons (lesson_id) ON DELETE CASCADE,
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order_index INTEGER NOT NULL DEFAULT 0,
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"createdBy" BIGINT NULL,
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"updatedBy" BIGINT NULL,
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"createdAt" TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
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"updatedAt" TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
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CONSTRAINT uq_unit_lessons_unit_lesson UNIQUE (unit_id, lesson_id)
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);
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CREATE INDEX idx_unit_lessons_unit_id ON unit_lessons (unit_id);
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CREATE INDEX idx_unit_lessons_lesson_id ON unit_lessons (lesson_id);
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CREATE INDEX idx_unit_lessons_order ON unit_lessons (order_index);
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-- ── 2. Backfill from the old direct FKs (preserves ordering) ─────────────────
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INSERT INTO course_units (course_id, unit_id, order_index, "createdBy", "createdAt", "updatedAt")
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SELECT u.course_id, u.unit_id, COALESCE(u.order_index, 0), u."createdBy", CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
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FROM units u
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WHERE u.course_id IS NOT NULL;
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INSERT INTO unit_lessons (unit_id, lesson_id, order_index, "createdBy", "createdAt", "updatedAt")
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SELECT l.unit_id, l.lesson_id, COALESCE(l.order_index, 0), l."createdBy", CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
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FROM lessons l
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WHERE l.unit_id IS NOT NULL;
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-- ── 3. Progress tables — standalone reads carry NULL course/unit context ─────
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ALTER TABLE unit_reading_progress ALTER COLUMN course_id DROP NOT NULL;
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ALTER TABLE lesson_reading_progress ALTER COLUMN course_id DROP NOT NULL;
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ALTER TABLE lesson_reading_progress ALTER COLUMN unit_id DROP NOT NULL;
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-- ── 4. Drop the old FK + order columns ───────────────────────────────────────
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-- (dependent indexes/constraints on these columns are dropped automatically)
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ALTER TABLE units DROP COLUMN course_id;
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ALTER TABLE units DROP COLUMN order_index;
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ALTER TABLE lessons DROP COLUMN unit_id;
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ALTER TABLE lessons DROP COLUMN order_index;
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COMMIT;
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-- ── Sanity checks (run after commit) ─────────────────────────────────────────
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-- SELECT COUNT(*) FROM course_units; -- should equal old COUNT(*) FROM units WHERE course_id IS NOT NULL
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-- SELECT COUNT(*) FROM unit_lessons; -- should equal old COUNT(*) FROM lessons WHERE unit_id IS NOT NULL
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-- SELECT c.title, u.title, cu.order_index FROM course_units cu
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-- JOIN courses c USING (course_id) JOIN units u USING (unit_id)
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-- ORDER BY c.title, cu.order_index LIMIT 20;
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