feat: move user aliases from config to DB with /bcs-alias command

Aliases now stored in UserState table instead of config.yaml. Adds
Aliases column (NVARCHAR 500), loads on startup, persists via flush.
New /bcs-alias slash command (view/set/clear) for managing nicknames.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

utils/database.py

@@ -138,6 +138,12 @@ class Database:
                 ALTER TABLE UserState ADD LastOffenseAt FLOAT NULL
         """)
 
+        # --- Schema migration for user aliases/nicknames ---
+        cursor.execute("""
+            IF COL_LENGTH('UserState', 'Aliases') IS NULL
+                ALTER TABLE UserState ADD Aliases NVARCHAR(500) NULL
+        """)
+
         cursor.execute("""
             IF NOT EXISTS (SELECT * FROM sys.tables WHERE name = 'BotSettings')
             CREATE TABLE BotSettings (
@@ -314,19 +320,20 @@ class Database:
         user_notes: str | None = None,
         warned: bool = False,
         last_offense_at: float | None = None,
+        aliases: str | None = None,
     ) -> None:
-        """Upsert user state (offense count, immunity, off-topic count, coherence baseline, notes, warned, last offense time)."""
+        """Upsert user state (offense count, immunity, off-topic count, coherence baseline, notes, warned, last offense time, aliases)."""
         if not self._available:
             return
         try:
             await asyncio.to_thread(
                 self._save_user_state_sync,
-                user_id, offense_count, immune, off_topic_count, baseline_coherence, user_notes, warned, last_offense_at,
+                user_id, offense_count, immune, off_topic_count, baseline_coherence, user_notes, warned, last_offense_at, aliases,
             )
         except Exception:
             logger.exception("Failed to save user state")
 
-    def _save_user_state_sync(self, user_id, offense_count, immune, off_topic_count, baseline_coherence, user_notes, warned, last_offense_at):
+    def _save_user_state_sync(self, user_id, offense_count, immune, off_topic_count, baseline_coherence, user_notes, warned, last_offense_at, aliases):
         conn = self._connect()
         try:
             cursor = conn.cursor()
@@ -337,14 +344,14 @@ class Database:
                    WHEN MATCHED THEN
                        UPDATE SET OffenseCount = ?, Immune = ?, OffTopicCount = ?,
                                   BaselineCoherence = ?, UserNotes = ?, Warned = ?,
-                                  LastOffenseAt = ?,
+                                  LastOffenseAt = ?, Aliases = ?,
                                   UpdatedAt = SYSUTCDATETIME()
                    WHEN NOT MATCHED THEN
-                       INSERT (UserId, OffenseCount, Immune, OffTopicCount, BaselineCoherence, UserNotes, Warned, LastOffenseAt)
-                       VALUES (?, ?, ?, ?, ?, ?, ?, ?);""",
+                       INSERT (UserId, OffenseCount, Immune, OffTopicCount, BaselineCoherence, UserNotes, Warned, LastOffenseAt, Aliases)
+                       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?);""",
                 user_id,
-                offense_count, 1 if immune else 0, off_topic_count, baseline_coherence, user_notes, 1 if warned else 0, last_offense_at,
-                user_id, offense_count, 1 if immune else 0, off_topic_count, baseline_coherence, user_notes, 1 if warned else 0, last_offense_at,
+                offense_count, 1 if immune else 0, off_topic_count, baseline_coherence, user_notes, 1 if warned else 0, last_offense_at, aliases,
+                user_id, offense_count, 1 if immune else 0, off_topic_count, baseline_coherence, user_notes, 1 if warned else 0, last_offense_at, aliases,
             )
             cursor.close()
         finally:
@@ -387,7 +394,7 @@ class Database:
         try:
             cursor = conn.cursor()
             cursor.execute(
-                "SELECT UserId, OffenseCount, Immune, OffTopicCount, BaselineCoherence, UserNotes, Warned, LastOffenseAt FROM UserState"
+                "SELECT UserId, OffenseCount, Immune, OffTopicCount, BaselineCoherence, UserNotes, Warned, LastOffenseAt, Aliases FROM UserState"
             )
             rows = cursor.fetchall()
             cursor.close()
@@ -401,6 +408,7 @@ class Database:
                     "user_notes": row[5] or "",
                     "warned": bool(row[6]),
                     "last_offense_at": float(row[7]) if row[7] is not None else 0.0,
+                    "aliases": row[8] or "",
                 }
                 for row in rows
             ]

utils/drama_tracker.py

@@ -30,6 +30,8 @@ class UserDrama:
     last_coherence_alert_time: float = 0.0
     # Per-user LLM notes
     notes: str = ""
+    # Known aliases/nicknames
+    aliases: list[str] = field(default_factory=list)
 
 
 class DramaTracker:
@@ -217,6 +219,16 @@ class DramaTracker:
     def clear_user_notes(self, user_id: int) -> None:
         self.get_user(user_id).notes = ""
 
+    def get_user_aliases(self, user_id: int) -> list[str]:
+        return self.get_user(user_id).aliases
+
+    def set_user_aliases(self, user_id: int, aliases: list[str]) -> None:
+        self.get_user(user_id).aliases = aliases
+
+    def get_all_aliases(self) -> dict[int, list[str]]:
+        """Return {user_id: [aliases]} for all users that have aliases set."""
+        return {uid: user.aliases for uid, user in self._users.items() if user.aliases}
+
     def reset_off_topic(self, user_id: int) -> None:
         user = self.get_user(user_id)
         user.off_topic_count = 0
@@ -298,6 +310,8 @@ class DramaTracker:
                     user.offense_count = 0
                     user.warned_since_reset = False
                     user.last_offense_time = 0.0
+            if state.get("aliases"):
+                user.aliases = [a.strip() for a in state["aliases"].split(",") if a.strip()]
             count += 1
         return count