Store a target's settings as columns (closes #543)

A target's settings move from the per-type JSON string in
targets.config to columns: url, headers, timeout_seconds,
forward_query, archive_expiry and archive_rotation. A column a type
does not use stays empty. headers holds the header map as JSON text
through GORM's JSON serializer, and archive_expiry holds a
time.Duration, 0 meaning never. The forms check each setting once,
with the same refusals and messages, and the edit form is filled from
the columns, so the per-type config structs, their parsers and the
"could not be read" branches are gone. A delivery task carries the
six settings in place of the JSON string; tests check that each copy
into a task, and back out of one, keeps all six.

Model: opus-5-5

internal/handlers/delivery_result_view_test.go

@@ -86,12 +86,12 @@ func seedFailedDeliveryWithResponse(
 }
 
 // seedFailureAndRender seeds a failed delivery against a
-// target of the given type and config, and returns the
+// target of the given type and URL, and returns the
 // rendered event log page.
 func seedFailureAndRender(
 	t *testing.T,
 	targetType database.TargetType,
-	config, responseBody string,
+	targetURL, responseBody string,
 ) string {
 	t.Helper()
 
@@ -109,7 +109,7 @@ func seedFailureAndRender(
 
 	wh := seedWebhook(t, db)
 	tgt := seedConfiguredTarget(
-		t, db, wh.ID, targetType, config,
+		t, db, wh.ID, targetType, database.Target{URL: targetURL},
 	)
 
 	seedFailedDeliveryWithResponse(
@@ -129,7 +129,7 @@ func TestHandleSourceLogs_RendersFailedAttempt(t *testing.T) {
 	body := seedFailureAndRender(
 		t,
 		database.TargetTypeHTTP,
-		`{"url":"https://example.com/hook/abc"}`,
+		"https://example.com/hook/abc",
 		"upstream exploded",
 	)
 
@@ -167,7 +167,7 @@ func TestHandleSourceLogs_EscapesResponseBody(t *testing.T) {
 	body := seedFailureAndRender(
 		t,
 		database.TargetTypeHTTP,
-		`{"url":"https://example.com/hook/abc"}`,
+		"https://example.com/hook/abc",
 		payload,
 	)
 
@@ -189,7 +189,7 @@ func TestHandleSourceLogs_RedactsCredentialEchoedInResponse(
 	body := seedFailureAndRender(
 		t,
 		database.TargetTypeSlack,
-		`{"webhookUrl":"`+slackWebhookURL+`"}`,
+		slackWebhookURL,
 		"no_service: "+slackWebhookURL,
 	)
 
@@ -228,7 +228,7 @@ func TestHandleSourceLogs_RedactsCredentialEchoedInError(
 	tgt := seedConfiguredTarget(
 		t, db, wh.ID,
 		database.TargetTypeSlack,
-		`{"webhookUrl":"`+slackWebhookURL+`"}`,
+		database.Target{URL: slackWebhookURL},
 	)
 
 	dlv := seedFailedDeliveryWithResponse(t, dbMgr, wh.ID, tgt.ID, "")
@@ -300,7 +300,7 @@ func TestHandleSourceLogs_RedactsCredentialSeveredByTheEngineCut(
 	body := seedFailureAndRender(
 		t,
 		database.TargetTypeSlack,
-		`{"webhookUrl":"`+slackWebhookURL+`"}`,
+		slackWebhookURL,
 		stored,
 	)
 
@@ -335,7 +335,7 @@ func TestHandleSourceLogs_RedactsCredentialSeveredBySQLCut(
 	body := seedFailureAndRender(
 		t,
 		database.TargetTypeSlack,
-		`{"webhookUrl":"`+slackWebhookURL+`"}`,
+		slackWebhookURL,
 		stored,
 	)
 
@@ -373,7 +373,7 @@ func TestHandleSourceLogs_RedactsForSoftDeletedTarget(
 	tgt := seedConfiguredTarget(
 		t, db, wh.ID,
 		database.TargetTypeSlack,
-		`{"webhookUrl":"`+slackWebhookURL+`"}`,
+		database.Target{URL: slackWebhookURL},
 	)
 
 	seedFailedDeliveryWithResponse(
@@ -413,7 +413,7 @@ func TestHandleSourceLogs_BoundsRenderedAttempts(t *testing.T) {
 
 	wh := seedWebhook(t, db)
 	tgt := seedConfiguredTarget(
-		t, db, wh.ID, database.TargetTypeLog, "",
+		t, db, wh.ID, database.TargetTypeLog, database.Target{},
 	)
 
 	dlv := seedFailedDeliveryWithResponse(t, dbMgr, wh.ID, tgt.ID, "")
@@ -480,7 +480,7 @@ func TestHandleSourceLogs_BoundsOversizeResponse(t *testing.T) {
 
 	wh := seedWebhook(t, db)
 	tgt := seedConfiguredTarget(
-		t, db, wh.ID, database.TargetTypeLog, "",
+		t, db, wh.ID, database.TargetTypeLog, database.Target{},
 	)
 
 	stored := strings.Repeat("A", responseCap*4) + tail