feat: start impliment postgres hooks

lib/hook/sql/hectic-version.sql

@@ -0,0 +1,26 @@
+CREATE SCHEMA IF NOT EXISTS "hectic";
+
+CREATE TABLE IF NOT EXISTS "hectic"."version" (
+    "name"          TEXT                 PRIMARY KEY,
+    "version"       TEXT                 NOT NULL,
+    "installed_at"  TIMESTAMPTZ          NOT NULL DEFAULT NOW()
+);
+
+DO $check$
+DECLARE
+    existing TEXT;
+BEGIN
+    SELECT "version" INTO existing
+    FROM "hectic"."version"
+    WHERE "name" = 'hectic';
+
+    IF existing IS NULL THEN
+        INSERT INTO "hectic"."version" ("name", "version")
+        VALUES ('hectic', '@HECTIC_VERSION@');
+    ELSIF existing <> '@HECTIC_VERSION@' THEN
+        RAISE EXCEPTION
+            'hectic schema version mismatch: database has %, code expects %',
+            existing, '@HECTIC_VERSION@';
+    END IF;
+END
+$check$;