diff --git a/dbal/ts/src/core/entities/session/clean-expired.ts b/dbal/ts/src/core/entities/session/clean-expired.ts
new file mode 100644
index 000000000..2c0f9f6e3
--- /dev/null
+++ b/dbal/ts/src/core/entities/session/clean-expired.ts
@@ -0,0 +1,31 @@
+/**
+ * @file clean-expired.ts
+ * @description Clean expired sessions operation
+ */
+import type { Result } from '../types';
+import type { InMemoryStore } from '../store/in-memory-store';
+
+/**
+ * Clean up expired sessions
+ * @returns Number of sessions removed
+ */
+export async function cleanExpiredSessions(store: InMemoryStore): Promise<Result<number>> {
+  const now = new Date();
+  const expiredIds: string[] = [];
+
+  for (const [id, session] of store.sessions) {
+    if (session.expiresAt < now) {
+      expiredIds.push(id);
+    }
+  }
+
+  for (const id of expiredIds) {
+    const session = store.sessions.get(id);
+    if (session) {
+      store.sessionTokens.delete(session.token);
+      store.sessions.delete(id);
+    }
+  }
+
+  return { success: true, data: expiredIds.length };
+}
diff --git a/dbal/ts/src/core/entities/session/create-session.ts b/dbal/ts/src/core/entities/session/create-session.ts
new file mode 100644
index 000000000..db6f57667
--- /dev/null
+++ b/dbal/ts/src/core/entities/session/create-session.ts
@@ -0,0 +1,39 @@
+/**
+ * @file create-session.ts
+ * @description Create session operation
+ */
+import type { Session, CreateSessionInput, Result } from '../types';
+import type { InMemoryStore } from '../store/in-memory-store';
+
+/**
+ * Create a new session in the store
+ */
+export async function createSession(
+  store: InMemoryStore,
+  input: CreateSessionInput
+): Promise<Result<Session>> {
+  if (!input.userId) {
+    return { success: false, error: { code: 'VALIDATION_ERROR', message: 'User ID required' } };
+  }
+  if (!store.users.has(input.userId)) {
+    return { success: false, error: { code: 'NOT_FOUND', message: 'User not found' } };
+  }
+  if (input.ttlSeconds <= 0) {
+    return { success: false, error: { code: 'VALIDATION_ERROR', message: 'TTL must be positive' } };
+  }
+
+  const session: Session = {
+    id: store.generateId('session'),
+    userId: input.userId,
+    token: store.generateToken(),
+    expiresAt: new Date(Date.now() + input.ttlSeconds * 1000),
+    ipAddress: input.ipAddress ?? '',
+    userAgent: input.userAgent ?? '',
+    createdAt: new Date(),
+  };
+
+  store.sessions.set(session.id, session);
+  store.sessionTokens.set(session.token, session.id);
+
+  return { success: true, data: session };
+}
diff --git a/dbal/ts/src/core/entities/session/delete-session.ts b/dbal/ts/src/core/entities/session/delete-session.ts
new file mode 100644
index 000000000..04609b635
--- /dev/null
+++ b/dbal/ts/src/core/entities/session/delete-session.ts
@@ -0,0 +1,25 @@
+/**
+ * @file delete-session.ts
+ * @description Delete session operation
+ */
+import type { Result } from '../types';
+import type { InMemoryStore } from '../store/in-memory-store';
+
+/**
+ * Delete a session by ID (logout)
+ */
+export async function deleteSession(store: InMemoryStore, id: string): Promise<Result<boolean>> {
+  if (!id) {
+    return { success: false, error: { code: 'VALIDATION_ERROR', message: 'ID required' } };
+  }
+
+  const session = store.sessions.get(id);
+  if (!session) {
+    return { success: false, error: { code: 'NOT_FOUND', message: `Session not found: ${id}` } };
+  }
+
+  store.sessionTokens.delete(session.token);
+  store.sessions.delete(id);
+
+  return { success: true, data: true };
+}
diff --git a/dbal/ts/src/core/entities/session/extend-session.ts b/dbal/ts/src/core/entities/session/extend-session.ts
new file mode 100644
index 000000000..e310bbf49
--- /dev/null
+++ b/dbal/ts/src/core/entities/session/extend-session.ts
@@ -0,0 +1,34 @@
+/**
+ * @file extend-session.ts
+ * @description Extend session expiration operation
+ */
+import type { Session, Result } from '../types';
+import type { InMemoryStore } from '../store/in-memory-store';
+
+/**
+ * Extend a session's expiration time
+ */
+export async function extendSession(
+  store: InMemoryStore,
+  id: string,
+  additionalSeconds: number
+): Promise<Result<Session>> {
+  if (!id) {
+    return { success: false, error: { code: 'VALIDATION_ERROR', message: 'ID required' } };
+  }
+  if (additionalSeconds <= 0) {
+    return { success: false, error: { code: 'VALIDATION_ERROR', message: 'Additional seconds must be positive' } };
+  }
+
+  const session = store.sessions.get(id);
+  if (!session) {
+    return { success: false, error: { code: 'NOT_FOUND', message: `Session not found: ${id}` } };
+  }
+
+  if (session.expiresAt < new Date()) {
+    return { success: false, error: { code: 'VALIDATION_ERROR', message: 'Cannot extend expired session' } };
+  }
+
+  session.expiresAt = new Date(session.expiresAt.getTime() + additionalSeconds * 1000);
+  return { success: true, data: session };
+}
diff --git a/dbal/ts/src/core/entities/session/get-session.ts b/dbal/ts/src/core/entities/session/get-session.ts
new file mode 100644
index 000000000..1bc5351b4
--- /dev/null
+++ b/dbal/ts/src/core/entities/session/get-session.ts
@@ -0,0 +1,38 @@
+/**
+ * @file get-session.ts
+ * @description Get session operations
+ */
+import type { Session, Result } from '../types';
+import type { InMemoryStore } from '../store/in-memory-store';
+
+/**
+ * Get a session by ID
+ */
+export async function getSession(store: InMemoryStore, id: string): Promise<Result<Session>> {
+  if (!id) {
+    return { success: false, error: { code: 'VALIDATION_ERROR', message: 'ID required' } };
+  }
+
+  const session = store.sessions.get(id);
+  if (!session) {
+    return { success: false, error: { code: 'NOT_FOUND', message: `Session not found: ${id}` } };
+  }
+
+  return { success: true, data: session };
+}
+
+/**
+ * Get a session by token
+ */
+export async function getSessionByToken(store: InMemoryStore, token: string): Promise<Result<Session>> {
+  if (!token) {
+    return { success: false, error: { code: 'VALIDATION_ERROR', message: 'Token required' } };
+  }
+
+  const id = store.sessionTokens.get(token);
+  if (!id) {
+    return { success: false, error: { code: 'NOT_FOUND', message: 'Session not found' } };
+  }
+
+  return getSession(store, id);
+}
diff --git a/dbal/ts/src/core/entities/session/index.ts b/dbal/ts/src/core/entities/session/index.ts
new file mode 100644
index 000000000..5f307968a
--- /dev/null
+++ b/dbal/ts/src/core/entities/session/index.ts
@@ -0,0 +1,10 @@
+/**
+ * @file index.ts
+ * @description Barrel export for session operations
+ */
+export { createSession } from './create-session';
+export { getSession, getSessionByToken } from './get-session';
+export { extendSession } from './extend-session';
+export { deleteSession } from './delete-session';
+export { listSessions } from './list-sessions';
+export { cleanExpiredSessions } from './clean-expired';
diff --git a/dbal/ts/src/core/entities/session/list-sessions.ts b/dbal/ts/src/core/entities/session/list-sessions.ts
new file mode 100644
index 000000000..38e00e907
--- /dev/null
+++ b/dbal/ts/src/core/entities/session/list-sessions.ts
@@ -0,0 +1,36 @@
+/**
+ * @file list-sessions.ts
+ * @description List sessions with filtering
+ */
+import type { Session, ListOptions, Result } from '../types';
+import type { InMemoryStore } from '../store/in-memory-store';
+
+/**
+ * List sessions with filtering and pagination
+ */
+export async function listSessions(
+  store: InMemoryStore,
+  options: ListOptions = {}
+): Promise<Result<Session[]>> {
+  const { filter = {}, page = 1, limit = 20 } = options;
+  const now = new Date();
+
+  let sessions = Array.from(store.sessions.values());
+
+  // Apply filters
+  if (filter.userId !== undefined) {
+    sessions = sessions.filter((s) => s.userId === filter.userId);
+  }
+  if (filter.activeOnly) {
+    sessions = sessions.filter((s) => s.expiresAt > now);
+  }
+
+  // Sort by created_at descending (newest first)
+  sessions.sort((a, b) => b.createdAt.getTime() - a.createdAt.getTime());
+
+  // Apply pagination
+  const start = (page - 1) * limit;
+  const paginated = sessions.slice(start, start + limit);
+
+  return { success: true, data: paginated };
+}