Document event_cleaning_interval and event_max_age options

doc/modules/service_domain_db.md

@@ -92,6 +92,24 @@ The database schema contains two tables:
 
 We use `id` field to sort records when paginating.
 
+## Service options
+
+### `event_cleaning_interval`
+
+The number of seconds between cleaning attempts of the `domain_events` table.
+
+* **Syntax:** positive integer
+* **Default:** `1800` (30 minutes)
+* **Example:** `event_cleaning_interval = 1800`
+
+### `event_max_age`
+
+The number of seconds after an event must be removed from the `domain_events` table.
+
+* **Syntax:** positive integer
+* **Default:** `7200` (2 hours)
+* **Example:** `event_max_age = 7200`
+
 # REST API
 
 We must provide REST API for Add/Remove and Enable/Disable interfaces of the

src/domain/service_domain_db.erl

@@ -38,7 +38,12 @@ stop() ->
 
 -spec config_spec() -> mongoose_config_spec:config_section().
 config_spec() ->
-    #section{items = #{}}.
+    #section{items = #{
+               <<"event_cleaning_interval">> => #option{type = integer,
+                                                        validate = positive},
+               <<"event_max_age">> => #option{type = integer,
+                                              validate = positive}
+              }}.
 
 start_link() ->
     gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).