feat: complete Phase 0 Enterprise IAM

src/db/migrations/sqlite/0008_create_sessions.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS sessions (
+    id           TEXT    PRIMARY KEY NOT NULL,
+    user_id      TEXT    NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    token_hash   TEXT    NOT NULL UNIQUE,
+    ip_address   TEXT,
+    user_agent   TEXT,
+    created_at   TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now')),
+    expires_at   TEXT    NOT NULL,
+    last_seen_at TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now')),
+    revoked      INTEGER NOT NULL DEFAULT 0
+);
+
+CREATE INDEX IF NOT EXISTS idx_sessions_user_id    ON sessions(user_id);
+CREATE INDEX IF NOT EXISTS idx_sessions_token_hash ON sessions(token_hash);
+CREATE INDEX IF NOT EXISTS idx_sessions_expires_at ON sessions(expires_at);