From e4ef43cb72276b05e3d6e10bd5920176be527c3b Mon Sep 17 00:00:00 2001
From: Alex Kotov <kotovalexarian@gmail.com>
Date: Sun, 5 Feb 2023 03:11:56 +0400
Subject: [PATCH] Add examples

---
 20230204224830_examples.down.sql |  4 ++++
 20230204224830_examples.up.sql   | 20 ++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 20230204224830_examples.down.sql
 create mode 100644 20230204224830_examples.up.sql

diff --git a/20230204224830_examples.down.sql b/20230204224830_examples.down.sql
new file mode 100644
index 0000000..b20b145
--- /dev/null
+++ b/20230204224830_examples.down.sql
@@ -0,0 +1,4 @@
+BEGIN;
+DROP TABLE example_texts;
+DROP TABLE examples;
+COMMIT;
diff --git a/20230204224830_examples.up.sql b/20230204224830_examples.up.sql
new file mode 100644
index 0000000..677670c
--- /dev/null
+++ b/20230204224830_examples.up.sql
@@ -0,0 +1,20 @@
+BEGIN;
+
+CREATE TABLE examples (
+    id BIGSERIAL PRIMARY KEY
+);
+
+CREATE TABLE example_texts (
+    id BIGSERIAL PRIMARY KEY,
+    example_id BIGINT NOT NULL REFERENCES examples (id),
+    language_id BIGINT NOT NULL REFERENCES languages (id),
+    index BIGINT NOT NULL,
+    value TEXT NOT NULL,
+    CONSTRAINT index_is_not_negative CHECK(index >= 0),
+    CONSTRAINT value_is_sane_text CHECK (is_sane_text(value))
+);
+
+CREATE UNIQUE INDEX example_texts_example_language_index
+    ON example_texts (example_id, language_id, index);
+
+COMMIT;