Feat; Create new table for collector configuration

database/schema.md

@@ -258,3 +258,15 @@ aid         benchmark   error
 ----------  ---         -----
 1           syn-1.0.89  Failed to compile...
 ```
+
+### collector_config
+
+Information about the collector; it's target architecture, when it was added, whether it is active and when it last had activity denoted by `last_heartbeat_at`.
+
+```
+sqlite> SELECT * FROM collector_config;
+
+id         target                     name  date_added     last_heartbeat_at  benchmark_set  is_active
+---------  -------------------------  ----  -------------  ----------------   ---------      -------
+1          aarch64-unknown-linux-gnu  foo   2025-06-11...  2025-06-12 17...   2              0
+```

database/src/pool/postgres.rs

@@ -285,6 +285,17 @@ static MIGRATIONS: &[&str] = &[
     alter table pstat_series drop constraint test_case;
     alter table pstat_series add constraint test_case UNIQUE(crate, profile, scenario, backend, target, metric);
     "#,
+    r#"
+    CREATE TABLE IF NOT EXISTS collector_config (
+        id                SERIAL PRIMARY KEY,
+        target            TEXT NOT NULL,
+        name              TEXT NOT NULL,
+        date_added        TIMESTAMPTZ DEFAULT NOW() NOT NULL,
+        last_heartbeat_at TIMESTAMPTZ,
+        benchmark_set     INTEGER NOT NULL,
+        is_active         BOOLEAN DEFAULT FALSE NOT NULL
+    );
+    "#,
 ];
 
 #[async_trait::async_trait]