KI-AGENT: Mailantworten und Entitätsverknüpfungen ergänzen

backend/db/migrations/0066_email_entity_links.sql

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+CREATE TABLE IF NOT EXISTS "email_entity_links" (
+    "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+    "tenant_id" bigint NOT NULL,
+    "message_id" uuid NOT NULL,
+    "entity_type" text NOT NULL,
+    "entity_id" bigint NOT NULL,
+    "linked_by" uuid,
+    "created_at" timestamp with time zone DEFAULT now() NOT NULL,
+    CONSTRAINT "email_entity_links_tenant_id_tenants_id_fk"
+        FOREIGN KEY ("tenant_id") REFERENCES "public"."tenants"("id")
+        ON DELETE cascade ON UPDATE cascade,
+    CONSTRAINT "email_entity_links_message_id_email_messages_id_fk"
+        FOREIGN KEY ("message_id") REFERENCES "public"."email_messages"("id")
+        ON DELETE cascade ON UPDATE cascade,
+    CONSTRAINT "email_entity_links_linked_by_auth_users_id_fk"
+        FOREIGN KEY ("linked_by") REFERENCES "public"."auth_users"("id")
+        ON DELETE set null ON UPDATE cascade
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS "email_entity_links_message_entity_key"
+    ON "email_entity_links" USING btree ("message_id", "entity_type", "entity_id");
+
+CREATE INDEX IF NOT EXISTS "email_entity_links_entity_idx"
+    ON "email_entity_links" USING btree ("tenant_id", "entity_type", "entity_id");
+
+CREATE INDEX IF NOT EXISTS "email_entity_links_message_idx"
+    ON "email_entity_links" USING btree ("message_id");