feat(service): timeout_sec без дефолта; 0=нет таймаута; operator v0.1.48

- api/v1alpha1/service_types.go: убрать +kubebuilder:default=30
- invoke.go: TimeoutSec=0 → &http.Client{} (без таймаута)
- services.go: валидация timeout_sec < 0 || > 900 → HTTP 400
- service_resource.go: TF schema Optional (без Computed); 0 → Int64Null()
- deployments/k8s/operator.yaml: v0.1.47 → v0.1.48
- doc/: progress.md + api/design.md (модель Service) + decisions/log.md
- examples/POSTGRES/: bug_hunter.sh, chaos_marathon.sh, chaos_marathon.tf

examples/POSTGRES/code/py-retry-writer/py_retry_writer.py

@@ -0,0 +1,54 @@
+# 2026-03-21 — py-retry-writer: пишет N строк с retry при PG ошибке.
+# Тестирует: устойчивость к transient PG errors (simulate_error=true), retry logic,
+# корректный rollback при частичном сбое.
+import os, time, psycopg2, random
+
+_MAX_RETRIES = 3
+
+def retry_write(event):
+    n = min(int(event.get("n", 5)), 100)
+    prefix = str(event.get("prefix", "retry"))[:40]
+    # simulate_error: с вероятностью 30% кидает OperationalError на 2-й попытке
+    simulate = str(event.get("simulate_error", "false")).lower() in ("true", "1")
+
+    attempt = 0
+    last_err = None
+
+    while attempt < _MAX_RETRIES:
+        attempt += 1
+        try:
+            conn = psycopg2.connect(
+                host=os.environ["PGHOST"], port=int(os.environ.get("PGPORT", 5432)),
+                dbname=os.environ["PGDATABASE"], user=os.environ["PGUSER"],
+                password=os.environ["PGPASSWORD"], sslmode=os.environ.get("PGSSLMODE", "require"),
+            )
+            inserted = []
+            try:
+                with conn.cursor() as cur:
+                    for i in range(n):
+                        # Симуляция: на первой попытке падаем с вероятностью 50%
+                        if simulate and attempt == 1 and i == n // 2:
+                            raise psycopg2.OperationalError("simulated transient error")
+                        title = f"{prefix}-{int(time.time()*1000)}-{i}-a{attempt}"
+                        cur.execute(
+                            "INSERT INTO terraform_demo_table (title) VALUES (%s) RETURNING id",
+                            (title,),
+                        )
+                        inserted.append(cur.fetchone()[0])
+                conn.commit()
+                return {
+                    "ok": True, "inserted": len(inserted),
+                    "attempts": attempt, "first_id": inserted[0] if inserted else None,
+                }
+            except Exception as e:
+                conn.rollback()
+                raise
+            finally:
+                conn.close()
+        except psycopg2.OperationalError as e:
+            last_err = str(e)
+            if attempt < _MAX_RETRIES:
+                time.sleep(0.3 * attempt)   # exponential backoff
+            continue
+
+    return {"ok": False, "attempts": attempt, "last_error": last_err}

examples/POSTGRES/code/py-retry-writer/requirements.txt

@@ -0,0 +1 @@
+psycopg2-binary