fix: hc900_map_master UNIQUE 인덱스 변경 + FF/Stream 컬럼 마이그레이션

- hc900_map_master: UNIQUE(tagname) → UNIQUE(controller_id, tagname)
  - 동일 태그명이 여러 컨트롤러에 존재 가능 (peer comms)
- ff_column_config: ALTER TABLE ADD COLUMN IF NOT EXISTS 10개 누락 컬럼
  (feed_tag, pressure_tag, level_tags, feed_filter_tau_sec 등)
- ff_stream_config: stream_key → key RENAME COLUMN + 12개 컬럼 추가
  (flow_tag, role, target_coeff, theta_up_sec, theta_dn_sec, tau_sec,
   sp_min, sp_max, rate_up_per_min, rate_dn_per_min, reflux_from_product, grade)
- EF Core HasIndex(tagname).IsUnique() → HasIndex(controller_id, tagname).IsUnique()
- GetSubArea/UpdateSubArea/DeletePoint: ToLowerInvariant 제거
  → OrdinalIgnoreCase 비교로 대체

src/Infrastructure/Database/Hc900DbContext.cs

@@ -44,7 +44,7 @@ public class Hc900DbContext : DbContext
         modelBuilder.Entity<Hc900MapEntry>(e =>
         {
             e.HasKey(x => x.Id);
-            e.HasIndex(x => x.TagName).IsUnique();
+            e.HasIndex(x => new { x.ControllerId, x.TagName }).IsUnique();
             e.HasIndex(x => x.Hc900Tag);
         });
 
@@ -461,6 +461,30 @@ public class Hc900DbService : IExperionDbService
             await _ctx.Database.ExecuteSqlRawAsync(
                 "ALTER TABLE hc900_map_master ADD COLUMN IF NOT EXISTS controller_id TEXT NOT NULL DEFAULT 'HC1'");
 
+            // hc900_map_master: tagname is unique PER controller, not globally — the same
+            // SignalTag name can exist on several controllers (peer comms). Replace the old
+            // UNIQUE(tagname) with UNIQUE(controller_id, tagname).
+            await _ctx.Database.ExecuteSqlRawAsync("""
+                DO $$
+                BEGIN
+                    IF EXISTS (
+                        SELECT 1 FROM pg_constraint
+                        WHERE conrelid = 'hc900_map_master'::regclass
+                          AND conname = 'hc900_map_master_tagname_key'
+                    ) THEN
+                        ALTER TABLE hc900_map_master DROP CONSTRAINT hc900_map_master_tagname_key;
+                    END IF;
+                    IF NOT EXISTS (
+                        SELECT 1 FROM pg_indexes
+                        WHERE tablename = 'hc900_map_master'
+                          AND indexname = 'ux_hc900_map_ctrl_tag'
+                    ) THEN
+                        CREATE UNIQUE INDEX ux_hc900_map_ctrl_tag
+                            ON hc900_map_master(controller_id, tagname);
+                    END IF;
+                END $$;
+                """);
+
             // realtime_table: UNIQUE(controller_id, tagname) for ON CONFLICT upsert
             await _ctx.Database.ExecuteSqlRawAsync("""
                 DO $$
@@ -1155,6 +1179,36 @@ public class Hc900DbService : IExperionDbService
                 ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS delta_p_tag            TEXT;
                 ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS delta_p_flood_limit    DOUBLE PRECISION NOT NULL DEFAULT 1e9;
                 ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS temp_high_limit        DOUBLE PRECISION NOT NULL DEFAULT 1e9;
+                -- migration: missing columns from the original CREATE TABLE (schema was json-based)
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS feed_tag              TEXT NOT NULL DEFAULT '';
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS pressure_tag          TEXT;
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS level_tags            TEXT;
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS feed_filter_tau_sec   DOUBLE PRECISION NOT NULL DEFAULT 300;
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS feed_move_thr_per_min DOUBLE PRECISION NOT NULL DEFAULT 0;
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS press_filter_tau_sec   DOUBLE PRECISION NOT NULL DEFAULT 60;
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS pressure_band         DOUBLE PRECISION NOT NULL DEFAULT 1e9;
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS settle_sec            DOUBLE PRECISION NOT NULL DEFAULT 0;
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS stale_sec             DOUBLE PRECISION NOT NULL DEFAULT 120;
+                ALTER TABLE ff_column_config ADD COLUMN IF NOT EXISTS product_key           TEXT NOT NULL DEFAULT 'P';
+                DO $$
+                BEGIN
+                    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_schema='hc900' AND table_name='ff_stream_config' AND column_name='stream_key')
+                       AND NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_schema='hc900' AND table_name='ff_stream_config' AND column_name='key') THEN
+                        ALTER TABLE hc900.ff_stream_config RENAME COLUMN stream_key TO key;
+                    END IF;
+                END $$;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS flow_tag              TEXT NOT NULL DEFAULT '';
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS role                  TEXT NOT NULL DEFAULT 'Monitor';
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS target_coeff          DOUBLE PRECISION NOT NULL DEFAULT 0;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS theta_up_sec          DOUBLE PRECISION NOT NULL DEFAULT 0;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS theta_dn_sec          DOUBLE PRECISION NOT NULL DEFAULT 0;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS tau_sec               DOUBLE PRECISION NOT NULL DEFAULT 0;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS sp_min                DOUBLE PRECISION NOT NULL DEFAULT 0;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS sp_max                DOUBLE PRECISION NOT NULL DEFAULT 1e9;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS rate_up_per_min       DOUBLE PRECISION NOT NULL DEFAULT 1e9;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS rate_dn_per_min       DOUBLE PRECISION NOT NULL DEFAULT 1e9;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS reflux_from_product   BOOLEAN NOT NULL DEFAULT FALSE;
+                ALTER TABLE ff_stream_config ADD COLUMN IF NOT EXISTS grade                 TEXT NOT NULL DEFAULT 'A';
                 """);
 
             // ── FF operator action audit log ────────────────────────────────
@@ -1414,9 +1468,8 @@ public class Hc900DbService : IExperionDbService
         var point = await _ctx.RealtimePoints.FindAsync(id);
         if (point == null) return new PointDeleteResult { Deleted = false };
 
-        var tagName = point.TagName;                                   // 예: "fi-6101.pv"
+        var tagName = point.TagName;                                   // 예: "FICQ-6101.pv"
-        var baseTag = (tagName.Contains('.') ? tagName[..tagName.IndexOf('.')] : tagName)
+        var baseTag = tagName.Contains('.') ? tagName[..tagName.IndexOf('.')] : tagName;
-                      .ToLowerInvariant();                            // "fi-6101"
 
         _ctx.RealtimePoints.Remove(point);
         await _ctx.SaveChangesAsync();
@@ -1924,9 +1977,9 @@ public class Hc900DbService : IExperionDbService
 
     public async Task<string?> GetSubAreaByTagNameAsync(string tagName)
     {
-        var baseTag = (tagName.Contains('.') ? tagName[..tagName.LastIndexOf('.')] : tagName).ToLowerInvariant();
+        var baseTag = tagName.Contains('.') ? tagName[..tagName.LastIndexOf('.')] : tagName;
         return await _ctx.TagMetadata
-            .Where(m => m.BaseTag == baseTag && m.Attribute == "sub_area")
+            .Where(m => m.BaseTag.Equals(baseTag, StringComparison.OrdinalIgnoreCase) && m.Attribute == "sub_area")
             .Select(m => m.Value)
             .FirstOrDefaultAsync();
     }
@@ -1991,7 +2044,6 @@ public class Hc900DbService : IExperionDbService
 
     public async Task<bool> UpdateSubAreaAsync(string baseTag, string? subArea)
     {
-        baseTag = baseTag.ToLowerInvariant();
         if (string.IsNullOrWhiteSpace(subArea))
         {
             var deleted = await _ctx.Database.ExecuteSqlRawAsync(