feat(l4d2-web): add command_history table for RCON console transcript

A row per RCON command execution: (user, server, command, reply, is_error,
created_at). Composite index on (user_id, server_id, id) supports the only
query shape — "latest N for this user+server", id DESC.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

l4d2web/alembic/versions/0012_command_history.py

@@ -0,0 +1,48 @@
+"""add command_history table
+
+Revision ID: 0012_command_history
+Revises: 0011_server_hostname
+Create Date: 2026-05-14
+"""
+from __future__ import annotations
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+
+revision: str = "0012_command_history"
+down_revision: Union[str, Sequence[str], None] = "0011_server_hostname"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "command_history",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("user_id", sa.Integer(), sa.ForeignKey("users.id"), nullable=False),
+        sa.Column(
+            "server_id",
+            sa.Integer(),
+            sa.ForeignKey("servers.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column("command", sa.Text(), nullable=False),
+        sa.Column("reply", sa.Text(), nullable=False, server_default=""),
+        sa.Column(
+            "is_error", sa.Boolean(), nullable=False, server_default=sa.text("0")
+        ),
+        sa.Column("created_at", sa.DateTime(), nullable=False),
+    )
+    op.create_index(
+        "ix_cmdhist_user_server_id",
+        "command_history",
+        ["user_id", "server_id", "id"],
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_cmdhist_user_server_id", table_name="command_history")
+    op.drop_table("command_history")

l4d2web/models.py

@@ -227,3 +227,26 @@ class SteamUserProfile(Base):
     persona_name: Mapped[str] = mapped_column(String(64), nullable=False)
     avatar_url: Mapped[str] = mapped_column(Text, nullable=False)
     fetched_at: Mapped[datetime] = mapped_column(DateTime, nullable=False)
+
+
+class CommandHistory(Base):
+    __tablename__ = "command_history"
+    __table_args__ = (
+        Index("ix_cmdhist_user_server_id", "user_id", "server_id", "id"),
+    )
+
+    id:         Mapped[int]      = mapped_column(Integer, primary_key=True)
+    user_id:    Mapped[int]      = mapped_column(ForeignKey("users.id"), nullable=False)
+    server_id:  Mapped[int]      = mapped_column(
+        ForeignKey("servers.id", ondelete="CASCADE"), nullable=False
+    )
+    command:    Mapped[str]      = mapped_column(Text, nullable=False)
+    reply:      Mapped[str]      = mapped_column(
+        Text, nullable=False, default="", server_default=""
+    )
+    is_error:   Mapped[bool]     = mapped_column(
+        Boolean, nullable=False, default=False, server_default=text("0")
+    )
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime, default=now_utc, nullable=False
+    )