feat: start impliment postgres hooks

lib/hook/sql/hectic-migration.sql

@@ -0,0 +1,51 @@
+DO $bootstrap$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1
+        FROM pg_type t JOIN pg_namespace n ON n.oid = t.typnamespace
+        WHERE n.nspname = 'hectic' AND t.typname = 'migration_name'
+    ) THEN
+        CREATE DOMAIN "hectic"."migration_name" AS TEXT
+            CHECK (VALUE ~ '^[0-9]{14}-.*');
+    END IF;
+
+    IF NOT EXISTS (
+        SELECT 1
+        FROM pg_type t JOIN pg_namespace n ON n.oid = t.typnamespace
+        WHERE n.nspname = 'hectic' AND t.typname = 'sha256'
+    ) THEN
+        CREATE DOMAIN "hectic"."sha256" AS CHAR(64)
+            CHECK (VALUE ~ '^[0-9a-f]{64}$');
+    END IF;
+END
+$bootstrap$;
+
+CREATE OR REPLACE FUNCTION "hectic"."sha256_lower"() RETURNS trigger
+LANGUAGE plpgsql AS $fn$
+BEGIN
+    NEW."hash" := lower(NEW."hash");
+    RETURN NEW;
+END
+$fn$;
+
+CREATE TABLE IF NOT EXISTS "hectic"."migration" (
+    "id"          SERIAL                  PRIMARY KEY,
+    "name"        "hectic"."migration_name" UNIQUE NOT NULL,
+    "hash"        "hectic"."sha256"         UNIQUE NOT NULL,
+    "applied_at"  TIMESTAMPTZ             NOT NULL DEFAULT NOW()
+);
+
+DO $trg$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1 FROM pg_trigger
+        WHERE tgname = 'hectic_t_sha256_lower'
+          AND tgrelid = '"hectic"."migration"'::regclass
+          AND NOT tgisinternal
+    ) THEN
+        CREATE TRIGGER "hectic_t_sha256_lower"
+            BEFORE INSERT OR UPDATE ON "hectic"."migration"
+            FOR EACH ROW EXECUTE FUNCTION "hectic"."sha256_lower"();
+    END IF;
+END
+$trg$;