Build every database's schema from embedded SQL files (closes #56)

The main database, each webhook's event database and each archive file
get their schema from SQL files under internal/db/migrations/, one
directory per kind. Opening a file runs, in one transaction, each file
that schema_migrations does not list. GORM stays for queries.
AutoMigrate is gone, tests included.

An event database holds only its own tables now, so the sweep that
removed target rows copied into it is deleted. The association guard
stays: without it a delivery write fails on the missing targets table.

AutoMigrate also had GORM parse every model before a handle was shared.
That is now done on its own: GORM races when two goroutines first use
models that refer to each other.

Model: opus-5-5

internal/db/migrations/migrations_test.go

@@ -0,0 +1,57 @@
+package migrations_test
+
+import (
+	"database/sql"
+	"log/slog"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	_ "modernc.org/sqlite"
+	"sneak.berlin/go/webhooker/internal/db/migrations"
+	"sneak.berlin/go/webhooker/internal/gormlog"
+)
+
+// TestApplyRunsEachFileOnce applies each kind of database file's
+// migrations to a new file twice. The first time records every file.
+// The second finds them all recorded and runs none, which is the only
+// way it can succeed: 001_schema.sql creates tables that then exist.
+func TestApplyRunsEachFileOnce(t *testing.T) {
+	t.Parallel()
+
+	for _, dir := range []string{
+		migrations.Main, migrations.Events, migrations.Archive,
+	} {
+		t.Run(dir, func(t *testing.T) {
+			t.Parallel()
+
+			sqlDB, err := sql.Open(
+				"sqlite", filepath.Join(t.TempDir(), "test.db"),
+			)
+			require.NoError(t, err)
+
+			t.Cleanup(func() { _ = sqlDB.Close() })
+
+			db, err := gorm.Open(
+				sqlite.Dialector{Conn: sqlDB},
+				&gorm.Config{
+					Logger: gormlog.New(slog.New(slog.DiscardHandler)),
+				},
+			)
+			require.NoError(t, err)
+
+			require.NoError(t, migrations.Apply(db, dir))
+			require.NoError(t, migrations.Apply(db, dir))
+
+			var versions string
+
+			require.NoError(t, sqlDB.QueryRowContext(t.Context(),
+				"SELECT group_concat(version) FROM schema_migrations",
+			).Scan(&versions))
+			assert.Equal(t, "0,1", versions)
+		})
+	}
+}