diff --git a/backend/migrations/versions/e8b3f1a6c2d4_profile_history_reads.py b/backend/migrations/versions/e8b3f1a6c2d4_profile_history_reads.py
new file mode 100644
index 0000000..691aad1
--- /dev/null
+++ b/backend/migrations/versions/e8b3f1a6c2d4_profile_history_reads.py
@@ -0,0 +1,52 @@
+"""profile history reads
+
+Revision ID: e8b3f1a6c2d4
+Revises: d8e3b5a1c7f4
+Create Date: 2026-10-19 03:00:00.000000
+
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+revision: str = "e8b3f1a6c2d4"
+down_revision: str | None = "d8e3b5a1c7f4"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+_PEER_STATE = (
+    "first_name, last_name, username, phone, photo_unique_id, is_deleted_account"
+)
+
+
+def upgrade() -> None:
+    op.execute(
+        "ALTER TABLE peer_history DROP CONSTRAINT peer_history_pkey, "
+        "ADD CONSTRAINT peer_history_pkey "
+        f"PRIMARY KEY (account_id, peer_id, observed_at) INCLUDE ({_PEER_STATE})"
+    )
+    op.execute(
+        "ALTER TABLE chat_history DROP CONSTRAINT chat_history_pkey, "
+        "ADD CONSTRAINT chat_history_pkey "
+        "PRIMARY KEY (account_id, chat_id, message_id, ts)"
+    )
+    op.execute(
+        "CREATE INDEX ix_memberships_user ON memberships (account_id, user_id, ts DESC)"
+    )
+    op.execute(
+        "CREATE INDEX ix_jobs_kind_created ON jobs (account_id, kind, created_at DESC)"
+    )
+
+
+def downgrade() -> None:
+    op.execute("DROP INDEX IF EXISTS ix_jobs_kind_created")
+    op.execute("DROP INDEX IF EXISTS ix_memberships_user")
+    op.execute(
+        "ALTER TABLE chat_history DROP CONSTRAINT chat_history_pkey, "
+        "ADD CONSTRAINT chat_history_pkey PRIMARY KEY (account_id, chat_id, message_id)"
+    )
+    op.execute(
+        "ALTER TABLE peer_history DROP CONSTRAINT peer_history_pkey, "
+        "ADD CONSTRAINT peer_history_pkey PRIMARY KEY (account_id, peer_id, observed_at)"
+    )
diff --git a/backend/src/utils/db/models.py b/backend/src/utils/db/models.py
index 55cca3a..30fc3b9 100644
--- a/backend/src/utils/db/models.py
+++ b/backend/src/utils/db/models.py
@@ -356,7 +356,7 @@ class ChatHistory(SQLModel, table=True):
     title: str | None = None
     photo_unique_id: str | None = None
     actor_id: int | None = Field(default=None, sa_column=Column(BigInteger))
-    ts: datetime = Field(sa_column=Column(DateTime(timezone=True), nullable=False))
+    ts: datetime = Field(sa_column=Column(DateTime(timezone=True), primary_key=True))
     raw: dict[str, Any] = Field(
         default_factory=dict, sa_column=Column(JSONB, nullable=False)
     )