Add autoscaling policy model and deterministic planner

src/lib/server/autoscaling/schema.ts

@@ -0,0 +1,35 @@
+import type Database from 'better-sqlite3';
+
+export function ensureAutoscalingSchema(handle: Database.Database): void {
+    handle.exec(`
+        CREATE TABLE IF NOT EXISTS autoscaling_policies (
+            id TEXT PRIMARY KEY, game TEXT NOT NULL, map_slug TEXT NOT NULL,
+            revision INTEGER NOT NULL DEFAULT 1, settings TEXT NOT NULL,
+            mode TEXT NOT NULL DEFAULT 'off', next_action_at INTEGER NOT NULL DEFAULT 0,
+            paused_reason TEXT, owns_map INTEGER NOT NULL DEFAULT 0, updated_at TEXT NOT NULL,
+            UNIQUE(game,map_slug)
+        );
+        CREATE TABLE IF NOT EXISTS autoscaling_members (
+            policy_id TEXT NOT NULL REFERENCES autoscaling_policies(id), server TEXT NOT NULL,
+            identity TEXT NOT NULL, observation TEXT NOT NULL, adopted INTEGER NOT NULL DEFAULT 0,
+            PRIMARY KEY(policy_id,server)
+        );
+        CREATE TABLE IF NOT EXISTS autoscaling_decisions (
+            id TEXT PRIMARY KEY, policy_id TEXT NOT NULL REFERENCES autoscaling_policies(id),
+            revision INTEGER NOT NULL, evaluated_at INTEGER NOT NULL, last_seen_at INTEGER NOT NULL,
+            fingerprint TEXT NOT NULL, decision TEXT NOT NULL, evidence TEXT NOT NULL,
+            operation_id TEXT UNIQUE REFERENCES server_deployments(id), resolved INTEGER NOT NULL DEFAULT 1
+        );
+        CREATE UNIQUE INDEX IF NOT EXISTS autoscaling_one_intent ON autoscaling_decisions(policy_id) WHERE resolved=0;
+        CREATE INDEX IF NOT EXISTS autoscaling_history ON autoscaling_decisions(policy_id,evaluated_at DESC);
+        CREATE TABLE IF NOT EXISTS autoscaling_samples (
+            policy_id TEXT NOT NULL REFERENCES autoscaling_policies(id), sampled_at INTEGER NOT NULL,
+            mode TEXT NOT NULL, occupied INTEGER NOT NULL, empty INTEGER NOT NULL, unknown INTEGER NOT NULL,
+            deficit INTEGER NOT NULL, PRIMARY KEY(policy_id,sampled_at)
+        );
+        CREATE TABLE IF NOT EXISTS autoscaling_authorizations (
+            operation_id TEXT PRIMARY KEY, policy_id TEXT NOT NULL, revision INTEGER NOT NULL,
+            expires_at INTEGER NOT NULL, claimed_at INTEGER, revoked_at INTEGER
+        );
+    `);
+}