Feat; Create new table for collector configuration

database/schema.md

@@ -259,7 +259,6 @@ aid         benchmark   error
 1           syn-1.0.89  Failed to compile...
 ```
 
-
 ## New benchmarking design
 We are currently implementing a new design for dispatching benchmarks to collector(s) and storing
 them in the database. It will support new use-cases, like backfilling of new benchmarks into a parent
@@ -296,3 +295,15 @@ Columns:
   * `completed`: Completed request.
 * **backends** (`text NOT NULL`): Comma-separated list of codegen backends to benchmark. If empty, the default set of codegen backends will be benchmarked.
 * **profiles** (`text NOT NULL`): Comma-separated list of profiles to benchmark. If empty, the default set of profiles will be benchmarked.
+
+### 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

@@ -309,6 +309,22 @@ static MIGRATIONS: &[&str] = &[
     // Prevent multiple try commits without a `sha` and the same `pr` number
     // being added to the table
     r#"CREATE UNIQUE INDEX benchmark_request_pr_commit_type_idx ON benchmark_request (pr, commit_type) WHERE status != 'completed';"#,
+    r#"
+    CREATE TABLE IF NOT EXISTS collector_config (
+        id                SERIAL PRIMARY KEY,
+        target            TEXT NOT NULL,
+        name              TEXT NOT NULL UNIQUE,
+        date_added        TIMESTAMPTZ DEFAULT NOW() NOT NULL,
+        last_heartbeat_at TIMESTAMPTZ,
+        benchmark_set     INTEGER NOT NULL,
+        is_active         BOOLEAN DEFAULT FALSE NOT NULL,
+
+        -- Given the current setup, we do not want 2 collectors that are active
+        -- with the same target using the same benchmark set.
+        CONSTRAINT collector_config_target_bench_active_uniq
+            UNIQUE (target, benchmark_set, is_active)
+    );
+    "#,
 ];
 
 #[async_trait::async_trait]