feat(agent): per-user memory isolation — owner_id→user_id + user-scoped memory tiers

migrations/sqlite/schema.sqlite.sql

@@ -1507,7 +1507,7 @@ CREATE INDEX IF NOT EXISTS idx_flow_trigger_flow ON flow_trigger(flow_id);
 CREATE TABLE IF NOT EXISTS ai_agents (
     id INTEGER PRIMARY KEY,
     tenant_id TEXT NOT NULL DEFAULT 'default',
-    owner_id INTEGER,
+    user_id INTEGER,
     name TEXT NOT NULL,
     system_prompt TEXT NOT NULL DEFAULT '',
     provider TEXT NOT NULL,
@@ -1527,7 +1527,7 @@ CREATE TABLE IF NOT EXISTS ai_sessions (
     id INTEGER PRIMARY KEY,
     tenant_id TEXT NOT NULL DEFAULT 'default',
     agent_id INTEGER NOT NULL,
-    owner_id INTEGER NOT NULL,
+    user_id INTEGER NOT NULL,
     title TEXT NOT NULL DEFAULT '',
     status TEXT NOT NULL DEFAULT 'open',
     meta TEXT,
@@ -1537,7 +1537,7 @@ CREATE TABLE IF NOT EXISTS ai_sessions (
     last_active_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ','now'))
 );
 CREATE INDEX IF NOT EXISTS idx_ai_sessions_tenant_agent ON ai_sessions(tenant_id, agent_id);
-CREATE INDEX IF NOT EXISTS idx_ai_sessions_owner_active ON ai_sessions(owner_id, last_active_at);
+CREATE INDEX IF NOT EXISTS idx_ai_sessions_owner_active ON ai_sessions(user_id, last_active_at);
 
 CREATE TABLE IF NOT EXISTS ai_messages (
     id INTEGER PRIMARY KEY,
@@ -1566,6 +1566,7 @@ CREATE TABLE IF NOT EXISTS ai_memories (
     id INTEGER PRIMARY KEY,
     tenant_id TEXT NOT NULL DEFAULT 'default',
     agent_id INTEGER NOT NULL,
+    user_id BIGINT,
     session_id INTEGER,
     mem_key TEXT NOT NULL,
     content TEXT NOT NULL,
@@ -1575,7 +1576,7 @@ CREATE TABLE IF NOT EXISTS ai_memories (
     pinned INTEGER NOT NULL DEFAULT 0,
     created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ','now')),
     updated_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ','now')),
-    UNIQUE (tenant_id, agent_id, mem_key)
+    UNIQUE (tenant_id, agent_id, user_id, mem_key)
 );
 CREATE INDEX IF NOT EXISTS idx_ai_memories_agent_live ON ai_memories(agent_id, superseded_by);
 CREATE INDEX IF NOT EXISTS idx_ai_memories_agent_category ON ai_memories(agent_id, category);